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Document and Entity Information	12 Months Ended
Document and Entity Information	Dec. 31, 2019 shares
Document Information [Line Items]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Registrant Name	Viomi Technology Co., Ltd
Entity Central Index Key	0001742770
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Interactive Data Current	Yes
Document Annual Report	true
Document Transition Report	false
Document Shell Company Report	false
Document Registration Statement	false
Entity Bankruptcy Proceedings, Reporting Current	false
Document Accounting Standard	U.S. GAAP
Entity File Number	001-38649
Entity Incorporation, State or Country Code	E9
Entity Address, Address Line One	Wansheng Square, Rm 1302 Tower C
Entity Address, Address Line Two	Xingang East Road
Entity Address, Address Line Three	Haizhu District Guangzhou
Entity Address, City or Town	Guangdong
Entity Address, Country	CN
Entity Address, Postal Zip Code	510220
Business Contact
Document Information [Line Items]
Entity Address, Address Line One	Wansheng Square, Rm 1302 Tower C
Entity Address, Address Line Two	Xingang East Road
Entity Address, Address Line Three	Haizhu District Guangzhou
Entity Address, City or Town	Guangdong
Entity Address, Country	CN
Entity Address, Postal Zip Code	510220
Contact Personnel Name	Shun Jiang
City Area Code	20
Local Phone Number	8930 9496
Contact Personnel Email Address	jiangshun@viomi.com.cn
Class A Ordinary Shares
Document Information [Line Items]
Entity Common Stock, Shares Outstanding	98,444,732
Title of 12(b) Security	Class A ordinary shares, par value US$0.00001 per share
Security Exchange Name	NASDAQ
No Trading Symbol Flag	true
Class B Ordinary Shares
Document Information [Line Items]
Entity Common Stock, Shares Outstanding	110,850,000
American Depositary Shares
Document Information [Line Items]
Title of 12(b) Security	American depositary shares, each representing three Class A ordinary shares
Trading Symbol	VIOT
Security Exchange Name	NASDAQ

CONSOLIDATED BALANCE SHEETS ¥ in Thousands, $ in Thousands	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)
Current assets
Cash and cash equivalents	¥ 972,438	$ 139,682	¥ 940,298
Restricted cash	30,567	4,391	29,550
Short-term deposits	60,000	8,618
Short-term investments	316,201	45,419	168,993
Accounts and notes receivable from third parties (net of allowance of nil and RMB2,006 as of December 31, 2018 and 2019, respectively)	316,189	45,418	111,718
Accounts receivable from a related party (net of allowance of nil and nil as of December 31, 2018 and 2019, respectively)	707,947	101,691	260,984
Other receivables from related parties (net of allowance of nil and nil as of December 31, 2018 and 2019, respectively)	23,944	3,439	112,320
Inventories	418,015	60,044	231,975
Prepaid expenses and other current assets	62,314	8,951	46,890
Total current assets	2,907,615	417,653	1,902,728
Non-current assets
Property, plant and equipment, net	67,293	9,666	11,301
Deferred tax assets	12,276	1,763	5,234
Prepaid expenses and other non-current assets	11,170	1,604	3,636
Intangible assets, net	4,357	626	169
Right-of-use assets, net	19,762	2,839
Total non-current assets	114,858	16,498	20,340
Total assets	3,022,473	434,151	1,923,068
Current liabilities
Accounts and notes payable (including accounts and notes payable of the consolidated variable interest entities and their subsidiaries (“VIEs”) without recourse to the Company of RMB548,481 and RMB1,043,159 as of December 31, 2018 and 2019, respectively)	1,043,159	149,840	548,481
Advances from customers (including advances from customers of the consolidated VIEs without recourse to the Company of RMB86,312 and RMB103,150 as of December 31, 2018 and 2019, respectively)	103,150	14,817	86,312
Amounts due to related parties (including amounts due to related parties of the consolidated VIEs without recourse to the Company of RMB5,763 and RMB25,106 as of December 31, 2018 and 2019, respectively)	25,106	3,606	5,763
Accrued expenses and other liabilities (including accrued expenses and other liabilities of the consolidated VIEs without recourse to the Company of RMB179,712 and RMB308,228 as of December 31, 2018 and 2019, respectively)	325,042	46,689	200,930
Short-term borrowing (including short-term borrowing of the consolidated VIEs without recourse to the Company of nil and RMB95,868 as of December 31, 2018 and 2019, respectively)	95,868	13,771
Income tax payables (including income tax payables of the consolidated VIEs without recourse to the Company of RMB10,199 and RMB33,522 as of December 31, 2018 and 2019, respectively)	33,522	4,815	10,199
Lease liabilities due within one year (including lease liabilities due within one year of the consolidated VIEs without recourse to the Company of nil and RMB6,802 as of December 31, 2018 and 2019, respectively)	6,993	1,004
Total current liabilities	1,632,840	234,542	851,685
Non-current liabilities
Accrued expenses and other liabilities (including accrued expenses and other liabilities of the consolidated VIEs without recourse to the Company of RMB518 and RMB1,795 as of December 31, 2018 and 2019, respectively)	1,795	258	518
Lease liabilities (including lease liabilities of the consolidated VIEs without recourse to the Company of nil and RMB13,391 as of December 31, 2018 and 2019, respectively)	13,391	1,923
Total non-current liabilities	15,186	2,181	518
Total liabilities	1,648,026	236,723	852,203
Commitments and contingencies (Note 21)
Shareholders’ equity
Additional paid-in capital	1,192,332	171,268	1,193,174
(Accumulated deficit) retained earnings	195,596	28,096	(95,527)
Accumulated other comprehensive loss	(19,145)	(2,750)	(29,786)
Total equity attributable to shareholders of Viomi Technology Co., Ltd (the "Company")	1,368,795	196,616	1,067,873
Non-controlling interests	5,652	812	2,992
Total shareholders’ equity	1,374,447	197,428	1,070,865
Total liabilities and shareholders’ equity	3,022,473	434,151	1,923,068
Class A Ordinary Shares
Shareholders’ equity
Ordinary shares, value	6	1	5
Class B Ordinary Shares
Shareholders’ equity
Ordinary shares, value	¥ 6	$ 1	¥ 7

CONSOLIDATED BALANCE SHEETS (Parenthetical) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 CNY (¥) shares	Dec. 31, 2018 CNY (¥) shares
Accounts and Notes Receivable, Net, Current	¥ 2,006	¥ 0
Accounts and notes payable current	1,043,159	548,481
Advances from customers	103,150	86,312
Amounts due to related parties	25,106	5,763
Accrued expenses and other liabilities current	325,042	200,930
Short-term borrowings	95,868
Income tax payables	33,522	10,199
Lease liabilities, current	6,993
Accrued expenses and other liabilities non current	1,795	518
Lease liabilities, non current	13,391
VIEs
Accounts and Notes Receivable, Net, Current	2,006
Accounts and notes payable current	1,043,159	548,481
Advances from customers	103,150	86,312
Amounts due to related parties	25,106	5,763
Accrued expenses and other liabilities current	308,228	179,712
Short-term borrowings	95,868
Income tax payables	33,522	10,199
Lease liabilities, current	6,802
Accrued expenses and other liabilities non current	1,795	518
Lease liabilities, non current	13,391
Related Party
Accounts and Notes Receivable, Net, Current	0	0
Accounts and Other Receivables, Net, Current	0	0
Third Party
Accounts and Notes Receivable, Net, Current	¥ 2,006	¥ 0
Class A Ordinary Shares
Common stock, shares authorized \| shares	4,800,000,000	4,800,000,000
Common stock, shares issued \| shares	98,444,732	90,200,000
Common stock, shares outstanding \| shares	98,444,732	90,200,000
Class B Ordinary Shares
Common stock, shares authorized \| shares	150,000,000	150,000,000
Common stock, shares issued \| shares	110,850,000	117,600,000
Common stock, shares outstanding \| shares	110,850,000	117,600,000

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥) ¥ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 CNY (¥) ¥ / shares shares	Dec. 31, 2017 CNY (¥) ¥ / shares shares
Net revenues:
A related party	¥ 2,112,170	$ 303,394	¥ 1,311,852	¥ 739,464
Third parties	2,535,343	364,179	1,249,377	133,755
Total net revenues	4,647,513	667,573	2,561,229	873,219
Cost of revenues (including RMB1,296, RMB14,733 and RMB48,424 with related parties for the years ended December 31, 2017, 2018 and 2019, respectively)	(3,565,109)	(512,095)	(1,843,432)	(598,036)
Gross profit	1,082,404	155,478	717,797	275,183
Operating expenses:
Research and development expenses(including nil, nil and RMB657 with a related party for the years ended December 31, 2017, 2018 and 2019, respectively)	(204,942)	(29,438)	(124,230)	(60,749)
Selling and marketing expenses (including RMB3,327, RMB24,598 and RMB81,851 with related parties for the years ended December 31, 2017, 2018 and 2019, respectively)	(529,212)	(76,017)	(379,554)	(95,296)
General and administrative expenses	(73,061)	(10,495)	(135,532)	(15,818)
Total operating expenses	(807,215)	(115,950)	(639,316)	(171,863)
Other income, net	35,880	5,154	1,829	2,236
Income from operations	311,069	44,682	80,310	105,556
Interest income and short-term investment income, net (including net interest expense of RMB1,271, RMB333 and nil with related parties for the years ended December 31, 2017, 2018 and 2019, respectively)	26,109	3,750	8,846	2,402
Other non-operating income	1,842	265	255
Income before income tax expenses	339,020	48,697	89,411	107,958
Income tax expenses	(45,190)	(6,491)	(24,061)	(14,718)
Net income	293,830	42,206	65,350	93,240
Less: Net (loss) income attributable to the non-controlling interest shareholders	1,660	238	(8)
Net income attributable to the Company	292,170	41,968	65,358	93,240
Net income attributable to ordinary shareholders of the Company	292,170	41,968	50,544	8,033
Net income attributable to the Company	292,170	41,968	65,358	93,240
Foreign currency translation adjustment	10,641	1,528	(11,782)	19,102
Total comprehensive income attributable to the Company	¥ 302,811	$ 43,496	¥ 53,576	¥ 112,342
Net income per ADS*
-Basic \| (per share)	¥ 1.40	$ 0.20	¥ 0.70	¥ 0.39
-Diluted \| (per share)	¥ 1.35	$ 0.19	¥ 0.64	¥ 0.31
Weighted average number of ADS used in calculating net income per ADS
-Basic \| shares	208,156,507	208,156,507	71,771,033	20,684,681
-Diluted \| shares	215,855,577	215,855,577	79,590,780	25,579,806
Series A Preferred Shares
Operating expenses:
Accretion of Series A Preferred Shares			¥ (6,563)	¥ (8,834)
Cumulative dividend			(7,631)	(10,803)
Undistributed earnings allocated				(7,061)
Class B Ordinary Shares
Operating expenses:
Cumulative dividend			¥ (620)	(877)
Undistributed earnings allocated				(52,533)
Unvested Class A Ordinary Shares
Operating expenses:
Undistributed earnings allocated				¥ (5,099)
American Depositary Shares
Net income per ADS*
-Basic \| (per share)	¥ 4.21	$ 0.60	¥ 2.10	¥ 1.17
-Diluted \| (per share)	¥ 4.06	$ 0.58	¥ 1.92	¥ 0.93
Weighted average number of ADS used in calculating net income per ADS
-Basic \| shares	69,385,502	69,385,502	23,923,678	6,894,894
-Diluted \| shares	71,951,859	71,951,859	26,530,260	8,526,602

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Selling and marketing expenses from related party	¥ 81,851		¥ 24,598	¥ 3,327
Interest expense from related party			333	1,271
Purchase from a related party	48,424		14,733	1,296
Research and development expenses related party	657
Share-based compensation expense	43,168		116,611	5,821
General and Administrative Expenses
Share-based compensation expense	7,282	$ 1,046	93,718	3,303
Research and Development Expenses
Share-based compensation expense	23,564	3,385	14,476	1,903
Selling and Marketing Expenses
Share-based compensation expense	¥ 12,322	$ 1,770	¥ 8,417	¥ 615

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' (DEFICIT) EQUITY ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)	Founder CNY (¥)	Conversion of Series A Redeemable Convertible Preferred Shares into Class A Ordinary Shares CNY (¥)	Conversion of Class B Redeemable Convertible Ordinary Shares into Class A Ordinary Shares and Class B Ordinary Shares CNY (¥)	2015 Share Incentive Plan CNY (¥)	2015 and 2018 Share Incentive Plan CNY (¥) shares	Class A Ordinary Shares shares	Class B Ordinary Shares shares	Common Stock Class A Ordinary Shares CNY (¥) shares	Common Stock Class A Ordinary Shares Founder shares	Common Stock Class A Ordinary Shares Conversion of Class A ordinary shares into Class B ordinary shares CNY (¥) shares	Common Stock Class A Ordinary Shares Conversion of Series A Redeemable Convertible Preferred Shares into Class A Ordinary Shares CNY (¥) shares	Common Stock Class A Ordinary Shares Conversion of Class B Redeemable Convertible Ordinary Shares into Class A Ordinary Shares and Class B Ordinary Shares CNY (¥) shares	Common Stock Class A Ordinary Shares Conversion of Class B ordinary shares into Class A ordinary shares CNY (¥) shares	Common Stock Class B Ordinary Shares CNY (¥) shares	Common Stock Class B Ordinary Shares Conversion of Class A ordinary shares into Class B ordinary shares CNY (¥) shares	Common Stock Class B Ordinary Shares Conversion of Class B Redeemable Convertible Ordinary Shares into Class A Ordinary Shares and Class B Ordinary Shares CNY (¥) shares	Common Stock Class B Ordinary Shares Conversion of Class B ordinary shares into Class A ordinary shares CNY (¥) shares	Additional Paid-in Capital CNY (¥)	Additional Paid-in Capital Founder CNY (¥)	Additional Paid-in Capital Conversion of Series A Redeemable Convertible Preferred Shares into Class A Ordinary Shares CNY (¥)	Additional Paid-in Capital Conversion of Class B Redeemable Convertible Ordinary Shares into Class A Ordinary Shares and Class B Ordinary Shares CNY (¥)	Additional Paid-in Capital 2015 Share Incentive Plan CNY (¥)	Additional Paid-in Capital 2015 and 2018 Share Incentive Plan CNY (¥)	(Accumulated Deficit) Retained Earnings CNY (¥)	Accumulated Other Comprehensive Loss CNY (¥)	(Accumulated Deficit) Retained Earnings CNY (¥)	(Accumulated Deficit) Retained Earnings Founder CNY (¥)	(Accumulated Deficit) Retained Earnings Conversion of Series A Redeemable Convertible Preferred Shares into Class A Ordinary Shares CNY (¥)	(Accumulated Deficit) Retained Earnings Conversion of Class B Redeemable Convertible Ordinary Shares into Class A Ordinary Shares and Class B Ordinary Shares CNY (¥)	(Accumulated Deficit) Retained Earnings 2015 Share Incentive Plan CNY (¥)	(Accumulated Deficit) Retained Earnings 2015 and 2018 Share Incentive Plan CNY (¥)	Non-Controlling Interest CNY (¥)
Balances at Dec. 31, 2016	¥ (278,940)									¥ 1										¥ 6,040						¥ (247,875)	¥ (37,106)	¥ (278,940)
Balances (in shares) at Dec. 31, 2016 \| shares										16,909,090
Vesting of restricted Class A ordinary shares	689									¥ 1										688								689
Vesting of restricted Class A ordinary shares (in shares) \| shares										8,454,546
Net income (loss)	93,240																									93,240		93,240
Share-based compensation related to restricted shares	2,718																			2,718								2,718
Share-based compensation related to Share Incentive Plan						¥ 2,817																		¥ 2,817								¥ 2,817
Appropriation to statutory reserves																				6,250						(6,250)
Accretion of Series A Preferred Shares	(8,834)																			(8,834)								(8,834)
Foreign currency translation adjustment	19,102																										19,102	19,102
Balances at Dec. 31, 2017	(169,208)									¥ 2										9,679						(160,885)	(18,004)	(169,208)
Balances (in shares) at Dec. 31, 2017 \| shares								25,363,636		25,363,636
Surrender and cancellation of Class A ordinary shares	457									¥ (1)										458								457
Surrender and cancellation of Class A ordinary shares (in Shares) \| shares										(11,754,546)
Vesting of restricted Class A ordinary shares	188																			188								188
Vesting of restricted Class A ordinary shares (in shares) \| shares										2,536,364
Net income (loss)	65,350																									65,358		65,358						¥ (8)
Share-based compensation related to restricted shares	840																			840								840
Share-based compensation related to Share Incentive Plan							¥ 25,391																		¥ 25,391								¥ 25,391
Share-based compensation related to the share awards			¥ 90,168																		¥ 90,168								¥ 90,168
Share-based compensation related to the share awards (in shares) \| shares											4,000,000
Accretion of Series A Preferred Shares	(6,563)																			(6,563)								(6,563)
Issuance of ordinary shares upon the completion of the Initial Public Offering (the "IPO")	633,508									¥ 2										633,506								633,508
Issuance of ordinary shares Initial Public Offering, in shares \| shares								34,200,000		34,200,000
Securities converted into Ordinary Shares upon the completion of the Initial Public Offering				¥ 165,095	¥ 274,421							¥ (1)	¥ 1	¥ 2			¥ 1	¥ 6				¥ 165,094	¥ 274,413							¥ 165,095	¥ 274,421
Securities have been converted into Ordinary Shares upon the completion of the Initial Public Offering (in shares) \| shares								18,181,818				(16,145,454)	18,181,818	33,818,182			16,145,454	101,454,546
Capital injection in a subsidiary from non controlling interest shareholder	3,000																																	3,000
Foreign currency translation adjustment	(11,782)																										(11,782)	(11,782)
Balances at Dec. 31, 2018	1,070,865									¥ 5						¥ 7				1,193,174						(95,527)	(29,786)	1,067,873						2,992
Balances (in shares) at Dec. 31, 2018 \| shares								90,200,000	117,600,000	90,200,000						117,600,000
Net income (loss)	293,830	$ 42,206																								292,170		292,170						1,660
Share-based compensation related to Share Incentive Plan							¥ 43,168																		¥ 43,168								¥ 43,168
Appropriation to statutory reserves																				1,047						(1,047)
Securities converted into Ordinary Shares upon the completion of the Initial Public Offering															¥ 1				¥ (1)
Securities have been converted into Ordinary Shares upon the completion of the Initial Public Offering (in shares) \| shares								6,750,000							6,750,000				(6,750,000)
Issuance of ordinary shares for exercised share options	1,741																			1,741								1,741
Issuance of ordinary shares for exercised share options (in shares) \| shares							1,494,732	1,494,732		1,494,732
Capital injection in a subsidiary from non controlling interest shareholder	3,000																																	3,000
Purchase of non-controlling interests	(2,196)																			(196)								(196)						(2,000)
Special dividends declared to ordinary shareholders	(46,602)																			(46,602)								(46,602)
Foreign currency translation adjustment	10,641	1,528																									10,641	10,641
Balances at Dec. 31, 2019	¥ 1,374,447	$ 197,428								¥ 6						¥ 6				¥ 1,192,332						¥ 195,596	¥ (19,145)	¥ 1,368,795						¥ 5,652
Balances (in shares) at Dec. 31, 2019 \| shares								98,444,732	110,850,000	98,444,732						110,850,000

CONSOLIDATED STATEMENTS OF CASH FLOWS ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Cash flows from operating activities
Net income (loss)	¥ 293,830	$ 42,206	¥ 65,350	¥ 93,240
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,577	3,387	2,270	1,680
Inventory write-down	15,661	2,250	1,059	81
Share-based compensation	43,168	6,201	116,611	5,821
Allowance for doubtful accounts	2,006	288	0
Loss from disposal of property and equipment	29	4	0
Deferred income tax benefits	(7,042)	(1,012)	(2,186)	(801)
Investment loss (income)	(4,654)	(669)	364
Changes in operating assets and liabilities:
Accounts and notes receivable from third parties	(206,477)	(29,659)	(107,370)	(4,348)
Accounts receivable from a related party	(446,963)	(64,202)	(11,436)	(204,527)
Inventories	(201,701)	(28,973)	(182,342)	(26,577)
Prepaid expenses and other current assets	(25,659)	(3,686)	(23,607)	(8,745)
Other receivables from related parties	88,376	12,694	(87,384)	(25,771)
Amounts due to related parties	19,343	2,778	4,005	1,179
Interest received relating to the investment income recognized in previous year	361	52	0
Accounts and notes payable	494,678	71,056	256,838	218,614
Advances from customers	16,838	2,419	59,297	19,312
Income tax payables	23,323	3,350	(1,413)	11,612
Accrued expenses and other liabilities	122,550	17,603	132,213	43,136
Lease liabilities	(5,760)	(827)	0
Net cash provided by operating activities	245,484	35,260	222,269	123,906
Cash flows from investing activities
Cash received from loan repayment from a related party		0	31,441
Purchase of equipment	(56,131)	(8,063)	(13,505)	(1,234)
Purchase of lease hold improvement	(7,874)	(1,131)	(216)
Purchase of intangible assets	(4,595)	(660)	(184)
Purchase of short-term investments	(812,086)	(116,649)	(238,714)
Maturity of short-term investments	670,190	96,267	69,357
Placement of short-term deposits	270,457	38,849	0
Maturities of short-term deposits	211,967	30,447	0
Proceeds from disposal of property and equipment	30	4	0
Net cash used in investing activities	(268,956)	(38,634)	(151,821)	(1,234)
Cash flows from financing activities
Dividend Paid	(46,602)	(6,694)	0
Proceeds from exercise of vested share options	1,109	159	0
Receipt of borrowing	95,868	13,771	0
Repayment of debt to a related party		0	(31,900)
Cash received from shareholders		0	2,705	2,671
Net proceeds from issuance of ordinary shares upon IPO		0	636,170
Cash paid in relation to issuance of ordinary shares upon IPO	(2,637)	(379)	0
Capital injection in subsidiaries from non-controlling shareholders	3,000	431	3,000
Purchase of non-controlling interests	(2,196)	(315)	0
Cash paid to a related party		0	(5,000)
Net cash provided by financing activities	48,542	6,973	604,975	2,671
Effect of exchange rate changes on cash and cash equivalents	8,087	1,162	14,473	(2,321)
Net increase in cash and cash equivalents and restricted cash	33,157	4,761	689,896	123,022
Cash and cash equivalents and restricted cash at the beginning of the year	969,848	139,312	279,952	156,930
Cash and cash equivalents and restricted cash at the end of the year	1,003,005	144,073	969,848	279,952
Cash and cash equivalents at the end of the year	972,438	139,682	940,298	279,952
Restricted cash at the end of the year	30,567	4,391	29,550
Supplemental disclosures of cash flow information:
Cash paid for income tax	(28,909)	(4,012)	(27,660)	(3,907)
Cash paid for interest expense	(995)	(143)	(768)	(1,785)
Acquisition of equipment in form of other payable	¥ 5,997	$ 862	¥ 430	¥ 54

Organization and Principal Activities

12 Months Ended

Dec. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Organization and Principal Activities

1.	ORGANIZATION AND PRINCIPAL ACTIVITIES

Viomi Technology Co., Ltd (the “Company”) is a holding company incorporated under the Laws of the Cayman Islands in January 2015. The Company, through its consolidated subsidiaries and “VIEs” (collectively referred to as the “Group”) is primarily engaged in the operation of developing and selling Internet-of-things-enabled (“IoT-enabled”) smart home products in the People’s Republic of China (“the PRC”).

(a)	History and Reorganization

The Group commenced its operations in May 2014 through Foshan Yunmi Electric Appliances Technology Co., Ltd. (“Foshan Viomi”), a PRC company established by Mr. Chen Xiaoping (“Mr. Chen” or the “Founder”), and Tianjin Jinxing Investment Co., Ltd. (“Tianjin Jinxing”), a subsidiary of Xiaomi Corporation (“Xiaomi”, also referring to entities controlled by Xiaomi Corporation where appropriate), who is an investor of the Company. Mr. Chen and Tianjin Jinxing invested RMB7,500 and RMB5,000 to establish Foshan Viomi and held 60% and 40% initial equity interests, respectively. Included in the RMB7,500 invested by Mr. Chen, RMB2,500 was invested by certain key management founders and held by Mr. Chen on their behalf (The key management founders, together with Mr. Chen are referred to “the Founders”). The Group has undertaken its reorganization (“Reorganization”) as detailed below.

In January 2015, the Company was incorporated in the Cayman Islands, Viomi HK Technology Co., Limited (“Viomi HK”) was incorporated in Hong Kong as a wholly owned subsidiary of the Company, Beijing Yunmi Technology Co., Ltd. (“Beijing Viomi”) was set up as a domestic company. In May 2015, Lequan Technology Beijing Co., Ltd (“Lequan”) was incorporated as a wholly owned subsidiary of Viomi HK in the PRC.

In July 2015, the Company issued 33,818,182 class A ordinary shares to exchange the interest of RMB2,500 in Foshan Viomi held by Mr. Chen on behalf of key management founders, 67,636,364 Class B redeemable convertible ordinary shares (Pre-IPO Class B Ordinary Shares) to exchange the interest of RMB5,000 in Foshan Viomi owned by Mr. Chen, and 67,636,364 Pre-IPO Class B Ordinary Shares to Red Better Limited (“Red Better”), a subsidiary of Xiaomi, and Shunwei Talent Limited (“Shunwei”), to exchange the interest of RMB5,000 held by Tianjin Jinxing. Concurrently, the Company obtained control over Foshan Viomi and Beijing Viomi through Lequan by entering into a series of contractual arrangements with Foshan Viomi, Beijing Viomi and their shareholders as detailed in note 1(c). As a result, Foshan Viomi and Beijing Viomi became the consolidated VIEs of the Group. The Reorganization lacks substance and should be treated as a non-substantive merger with no change in the basis of assets and liabilities of Foshan Viomi.

In addition, the Company issued 18,181,818 Series A Preferred Shares at the issue price of US$1.1 per share to a group of investors for considerations of US$20,000, including conversion of the outstanding bridge loans of US$5,250, which was provided by the same investors during January 2015 to July 2015. The remaining consideration was fully received in cash.

In June 2018, the Board of Directors and the shareholders approved a transfer and surrender of shares plan, pursuant to which, Mr. Chen, who holds 33,818,182 class A ordinary shares on behalf of certain key management founders through Viomi Limited, transferred 16,145,454 class A ordinary shares to key management founders and surrendered the remaining 17,672,728 class A ordinary shares to the Company.

Prior to the completion of the IPO, in accordance with written resolutions of all the shareholders of the Company on August 23, 2018, the Company effected a share split whereby each of the Company’s authorized and outstanding ordinary shares and preferred shares, par value of $0.0001 each, was divided into ten ordinary shares and preferred shares of the same series, par value US$0.00001 each, respectively. All shareholders surrendered 90% of their after-share-split outstanding shares back to the Company for cancellation. After the share split and the surrender of shares for cancellation, the number of the Company’s outstanding ordinary and preferred shares remained unchanged. As the number of outstanding shares remained unchanged, the share split does not have an impact to the basic and diluted net income per share for the years ended December 31, 2017. The par value per ordinary share has been retroactively revised as if it had been adjusted in proportion to the share split.

1.	ORGANIZATION AND PRINCIPAL ACTIVITIES (Continued)

As of December 31, 2019, details of the Company’s principal subsidiaries and VIEs were as follows:

	Place of incorporation	Date of incorporation	Percentage of beneficial ownership	Principal activities
Subsidiaries:
Viomi HK	Hong Kong	January 30, 2015	100%	Investment holding
Lequan	PRC	May 15, 2015	100%	Investment holding
Yunmi Hulian Technology (Guangdong) Co., Ltd.	PRC	December 9, 2019	100%	Investment holding
VIEs:
Foshan Viomi	PRC	May 6, 2014	100%	Home appliance development and sales
Beijing Viomi	PRC	January 12, 2015	100%	No substantial business
Subsidiaries of Foshan Viomi:
Guangdong Lizi Technology Co., Ltd. (“Guangdong Lizi”)	PRC	July 26, 2018	VIE’s subsidiary	Home appliance development and sales
Guangdong AI Touch Technology Co., Ltd. (“AI Touch”)	PRC	January 30, 2019	VIE’s subsidiary	Home appliance development and sales

(b)	Dual Classes Ordinary Shares and Initial Public Offering

On September 25, 2018, the Company completed its IPO on the NASDAQ Global Market in the United States of America. In this offering, 11,400,000 American Depositary Shares (“ADSs”), representing 34,200,000 Class A ordinary shares, were issued and sold to the public at a price of US$9.00 per ADS.

Pursuant to the resolution of the shareholders of the Company on August 23, 2018, the Company’s authorized share capital became US$50,000 divided into 5,000,000,000 shares comprising of the (i) 4,800,000,000 class A ordinary shares of a par value of US$0.00001 each (‘‘Class A Ordinary Shares’’), (ii) 150,000,000 class B ordinary shares of a par value of US$0.00001 each (‘‘Class B Ordinary Shares’’) and (iii) 50,000,000 shares of a par value of US$0.00001 each of such class or classes (however designated) as the board of directors may determine in accordance with post-offering amended and restated memorandum and articles of association. In respect of all matters subject to a shareholder vote, each Class A ordinary share is entitled to one vote, and each Class B Ordinary Share is entitled to ten (10) votes, voting together as one class. Each Class B Ordinary Share is convertible into one Class A Ordinary Share at any time by the holder thereof. Class A Ordinary Shares are not convertible into Class B Ordinary Shares under any circumstances. Upon any transfer of Class B Ordinary Shares by a holder to any person or entity other than holders of Class B Ordinary Shares or their affiliates, such Class B Ordinary Shares shall be automatically and immediately converted into the equivalent number of Class A Ordinary Shares.

Immediately prior to the completion of the IPO, 16,145,454 issued Class A Ordinary Shares held by certain key management founders, 33,818,182 issued Pre-IPO Class B Ordinary Shares held by Red Better, and 67,636,364 issued Pre-IPO Class B Ordinary Shares held by Mr. Chen’s wholly-owned entity Viomi Limited was automatically converted by way of re-designation and re-classification into Class B Ordinary Shares on a one-for-one basis, and the rest of the outstanding Class A Ordinary Shares, the rest of the outstanding Pre-IPO Class B Ordinary Shares, and all outstanding Series A Preferred Shares was automatically converted by way of re-designation and re-classification into Class A Ordinary Shares on a one-for-one basis.

1.	ORGANIZATION AND PRINCIPAL ACTIVITIES (Continued)

(c)	VIE Arrangements between the VIEs and the Company’s PRC subsidiary

The Company, through Lequan, entered into the following contractual arrangements with Foshan Viomi, Beijing Viomi and their shareholders that enable the Company through its PRC subsidiary to (1) have power to direct the activities that most significantly affects the economic performance of the VIEs, through the exercise of the shareholders’ rights under the shareholder voting proxy agreement as the shareholders’ meetings of the VIEs appoint the board of directors of the VIEs, and (2) receive the economic benefits of the VIEs that could be significant to the VIEs through the exclusive consultation and service agreement. Accordingly, Lequan is considered the primary beneficiary of the VIEs and has consolidated the VIEs’ financial results of operations, assets and liabilities in the Company’s consolidated financial statements.

In making the conclusion that Lequan is the primary beneficiary of the VIEs, the Company believes Lequan’s rights under the terms of the option agreement provide it with a substantive kick-out right. As advised by the Company’s PRC legal counsel, the Company believes the terms of the option agreement are valid, binding and enforceable under PRC laws and regulations currently in effect. The Company also believes that the consideration which is the minimum amount permitted by the applicable PRC law to exercise the option does not represent a financial barrier or disincentive for Lequan to currently exercise its rights under the exclusive option agreement.

A simple majority vote of Lequan’s board of directors is required to pass a resolution to exercise Lequan’s rights under the option agreement. Lequan’s rights under the option agreement give Lequan the power to control the shareholders of Foshan Viomi and Beijing Viomi. In addition, Lequan’s rights under the shareholder voting proxy agreement also reinforce Lequan’s abilities to direct the activities that most significantly impact the VIEs’ economic performance. The Company also believes that this ability to exercise control ensures that the VIEs will continue to execute consultation and service agreements and also ensures that consultation and service agreements will be executed and renewed indefinitely unless a written agreement is signed by all parties to terminate it or a mandatory termination is requested by PRC laws or regulations. Lequan has the rights to receive substantially all of the economic benefits from the VIEs.

Exclusive consulting and service agreement. In July 2015, Lequan entered into exclusive consultation and service agreements with Foshan Viomi and Beijing Viomi respectively to enable Lequan to receive substantially all of the economic benefits of the VIEs. Under the exclusive consultation and service agreements, Lequan has the exclusive right to provide or designate any entity affiliated with it to provide VIEs the technical and business support services, including information technology support, hardware management and updates, software development, maintenance and updates and other operating services. The exclusive consultation and service agreement could be indefinitely effective unless a written agreement is signed by all parties to terminate it or a mandatory termination is requested by PRC laws or regulations. The exclusive consultation and service agreement was effective in July 2015 and will remain effective until all equity interests and assets in Foshan Viomi and Beijing Viomi are sold to Lequan or the party designated by Lequan. Under this arrangement, Lequan has the sole discretion to receive an annual service fee at an amount up to 100% of the annual net income of Foshan Viomi and Beijing Viomi. In addition, Lequan is entitled to receive other technical service fees at the amount mutually agreed upon by Lequan and the respective VIE.

Equity pledge agreement. Pursuant to the equity pledge agreements in July 2015 among Foshan Viomi, Beijing Viomi, all of their shareholders and Lequan, all shareholders of Foshan Viomi and Beijing Viomi agreed to pledge their equity interests in Foshan Viomi or Beijing Viomi to Lequan to secure the performance of the VIEs’ obligations under the existing exclusive purchase option agreement, shareholder voting proxy agreement, exclusive consulting and service agreement and also the equity pledge agreement. The Pledge will remain binding until Foshan Viomi, Beijing Viomi and their shareholders discharge all their obligations under the contractual agreements.

Exclusive purchase option agreement. Pursuant to the exclusive option agreements entered into in July 2015 among Lequan, Foshan Viomi, Beijing Viomi and their shareholders, the shareholders of Foshan Viomi and Beijing Viomi are obligated to sell their equity interest to Lequan. Lequan has the exclusive and irrevocable right to purchase, or cause the shareholders of Foshan Viomi and Beijing Viomi to sell to the party designated by Lequan, in Lequan’s sole discretion, all of the shareholders’ equity interests or any assets in Foshan Viomi and Beijing Viomi when and to the extent that applicable PRC law permits Lequan to own such equity interests and assets in Foshan Viomi and Beijing Viomi. The price to be paid by Lequan or any party designated by Lequan will be the minimum amount of consideration permitted by applicable PRC law at the time when such transaction occurs. All of the shareholders promised and agreed that they will refund the consideration once received to Lequan or any party designated by Lequan within 10 working days. Also, the shareholders of Foshan Viomi and Beijing Viomi should try their best to help Foshan Viomi and Beijing Viomi develop well and are prohibited from transferring, pledging, intentionally terminating significant contracts or otherwise disposing of any significant assets in Foshan Viomi and Beijing Viomi without Lequan’s prior written consent. The exclusive option agreement will remain effective until all equity interests and assets in Foshan Viomi and Beijing Viomi are sold to Lequan or the party designated by Lequan.

1.	ORGANIZATION AND PRINCIPAL ACTIVITIES (Continued)

Shareholder voting proxy agreement. On July 21, 2015, all of the shareholders of Foshan Viomi and Beijing Viomi have executed a shareholder voting proxy agreement with Lequan, Foshan Viomi and Beijing Viomi, whereby all of the shareholders irrevocably appoint and constitute the person designated by Lequan as their attorney-in-fact to exercise on their behalf any and all rights that the shareholders have in respect of their equity interests in Foshan Viomi and Beijing Viomi. The shareholder voting proxy agreement will be indefinitely effective unless all parties decide to terminate it by written agreement.

In September 2018, Foshan Viomi reduced its registered capital and changed its shareholders from Mr. Chen and Tianjin Jinxing to Mr. Chen alone. Concurrently, the Group entered into a series of contractual arrangements in substantially the same forms with Foshan Viomi and Mr. Chen.

Management therefore concluded that the Company, through its PRC subsidiary and the above contractual arrangements, has the power to direct the activities that most significantly impact the VIEs' economic performance, bears the risks of and enjoys the rewards normally associated with ownership of the VIEs, and therefore the Company is the ultimate primary beneficiary of these VIEs. Consequently, the financial results of the VIEs were included in the Group's consolidated financial statements.

Risks in relation to VIE structure

The Company believes that the contractual arrangements between Lequan and its VIEs and their respective shareholders are in compliance with PRC laws and regulations and are legally enforceable. However, uncertainties in the PRC legal system could limit Lequan’s ability to enforce the contractual arrangements. If the legal structure and contractual arrangements were found to be in violation of PRC laws and regulations, the PRC government could:

•

revoke the business and operating licenses of the Company’s PRC subsidiary and VIEs;

•

discontinue or restrict the operations of any related-party transactions between the Company’s PRC subsidiary and VIEs;

•

limit the Group’s business expansion in China by way of entering into contractual arrangements;

•

impose fines or other requirements with which the Company’s PRC subsidiary and VIEs may not be able to comply;

•

impose additional conditions or requirements with which the Group may not be able to comply;

•

take other regulatory or enforcement actions against the Group that could be harmful to the Group’s business or

•

require the Company or the Company’s PRC subsidiary or VIEs to restructure the relevant ownership structure or operations.

The Company’s ability to conduct its business may be negatively affected if the PRC government were to carry out any of the aforementioned actions. As a result, the Company may not be able to consolidate its VIEs in its consolidated financial statements as it may lose the ability to exert effective control over the VIEs and their respective shareholders and it may lose the ability to receive economic benefits from the VIEs. The Company, however, does not believe such actions would result in the liquidation or dissolution of the Company, its PRC subsidiary or VIEs.

Mr. Chen is the only shareholder of Foshan Viomi and the largest shareholder of Beijing Viomi, and Mr. Chen is also the largest beneficiary owner of the Company. The interests of Mr. Chen as the largest beneficiary owner of the VIEs may differ from the interests of the Company as a whole, since Mr. Chen is only one of the beneficiary shareholders of the Company. The Company cannot assert that when conflicts of interest arise, Mr. Chen will act in the best interests of the Company or that conflicts of interests will be resolved in the Company’s favor. Currently, the Company does not have existing arrangements to address potential conflicts of interest Mr. Chen may encounter in his capacity as a beneficial owner and director of the VIEs, on the one hand, and as a beneficial owner and director of the Company, on the other hand. The Company relies on Mr. Chen, as a director and executive officer of the Company, to fulfill his fiduciary duties and abide by laws of the PRC and Cayman Islands and act in the best interest of the Company. If the Company cannot resolve any conflicts of interest or disputes between the Company and Mr. Chen, the Company would have to rely on legal proceedings, which could result in disruption of its business, and there is substantial uncertainty as to the outcome of any such legal proceedings.

1.	ORGANIZATION AND PRINCIPAL ACTIVITIES (Continued)

In addition, the other shareholder of Beijing Viomi is also a beneficial owner of the Company and therefore have no current interest in seeking to act contrary to the contractual arrangements. However, to further protect the investors’ interest from any risk that the shareholders of the Foshan Viomi and Beijing Viomi may act contrary to the contractual arrangements, the Company, through Lequan, entered into a shareholder voting proxy agreement with all of the shareholders of Foshan Viomi and Beijing Viomi in July 2015. The shareholder voting proxy agreement with the shareholder of Foshan Viomi has been updated in September 2018 as Foshan Viomi reduced its registered capital and changed its shareholders from Mr. Chen and Tianjin Jinxing to Mr. Chen alone. Through the shareholder voting proxy agreement, all shareholders of Foshan Viomi and Beijing Viomi have entrusted the person designated by Lequan as its proxy to exercise their rights as the shareholders of Foshan Viomi and Beijing Viomi with respect to an aggregate of 100% of the equity interests in Foshan Viomi and Beijing Viomi.

In March 2019, the National People’s Congress enacted PRC Foreign Investment Law which would be effective starting from January 1, 2020. The Foreign Investment Law does not explicitly classify contractual arrangements as a form of foreign investment, but it contains a catch-all provision under the definition of “foreign investment”, which includes investments made by foreign investors through means stipulated in laws or administrative regulations or other methods prescribed by the State Council. Existing laws or administrative regulations remain unclear whether the contractual arrangements with variable interest entities will be deemed to be in violation of the market access requirements for foreign investment under the PRC laws and regulations. However, the possibility that such entities will be deemed as foreign invested enterprise and subject to relevant restrictions in the future shall not be excluded. If variable interest entities fall within the definition of foreign investment entities, the Group's ability to use the contractual arrangements with its VIE and the Group's ability to conduct business through the VIE could be severely limited.

1.	ORGANIZATION AND PRINCIPAL ACTIVITIES (Continued)

The following table sets forth the assets, liabilities, results of operations and cash flows of the VIEs and its subsidiaries taken as a whole, which were included in the Group’s consolidated financial statements. All transactions and balances between the VIEs and the Group’s subsidiaries are eliminated in the financial information presented below:

	As of December 31,
	2018		2019
	RMB		RMB
Cash and cash equivalents		401,424		802,580
Restricted cash		29,550		30,567
Short-term deposits		—		60,000
Short-term investments		168,993		141,189
Accounts receivable from third parties (net of allowance of nil and RMB2,006 as of December 31, 2018 and 2019, respectively)		111,718		316,189
Accounts receivable from a related party (net of allowance of nil and nil as of December 31, 2018 and 2019, respectively)		260,984		707,947
Other receivable from related parties (net of allowance of nil and nil as of December 31, 2018 and 2019, respectively)		112,320		23,944
Inventories		231,975		418,015
Prepaid expenses and other current assets		46,499		61,031
Total current assets		1,363,463		2,561,462
Property, plant and equipment, net		11,301		67,293
Deferred tax assets		5,234		12,276
Intangible assets, net		169		4,357
Prepaid expenses and other non-current assets		3,636		11,170
Right-of-use assets, net		—		19,593
Total non-current assets		20,340		114,689
Total assets		1,383,803		2,676,151
Accounts and notes payable		548,481		1,043,159
Advances from customers		86,312		103,150
Amounts due to related parties		5,763		25,106
Accrued expenses and other liabilities		179,712		308,228
Short-term borrowing		—		95,868
Income tax payables		10,199		33,522
Lease liabilities due within one year		—		6,802
Total current liabilities		830,467		1,615,835
Accrued expenses and other liabilities		518		1,795
Lease liabilities		—		13,391
Total non-current liabilities		518		15,186
Total liabilities		830,985		1,631,021

	Year ended December 31,
	2017			2018			2019
	RMB			RMB			RMB
Revenue		873,083			2,561,229			4,647,513
Net income		92,159			70,232			285,221

Net cash provided by operating activities		123,182			209,690			240,823
Net cash used in investing activities		(1,234	)		(183,262	)		(97,702	)
Net cash (used in) provided by financing activities		—			(37,731	)		95,933

Significant Accounting Policies

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

SIGNIFICANT ACCOUNTING POLICIES

2.	SIGNIFICANT ACCOUNTING POLICIES

(a)	Basis of presentation

The consolidated financial statements of the Group have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) to reflect the financial position, results of operations and cash flows of the Group. Significant accounting policies followed by the Group in the preparation of the consolidated financial statements are summarized below.

(b)	Consolidation

The Group’s consolidated financial statements include the financial statements of the Company, its subsidiaries and VIEs for which the Company or its subsidiary is the primary beneficiary. All transactions and balances among the Company, its subsidiaries and VIEs have been eliminated upon consolidation.

A subsidiary is an entity in which the Company, directly or indirectly, controls more than one half of the voting powers; or has the power to appoint or remove the majority of the members of the board of directors; or to cast a majority of votes at the meeting of directors; or has the power to govern the financial and operating policies of the investee under a statute or agreement among the shareholders or equity holders.

A VIE is an entity in which the Company, or its subsidiary, through contractual agreements, bears the risks of, and enjoys the rewards normally associated with ownership of the entity, and therefore the Company or its subsidiary is the primary beneficiary of the entity. In determining whether the Company or its subsidiaries are the primary beneficiary, the Company considered whether it has the power to direct activities that are significant to the VIE’s economic performance, and also the Company’s obligation to absorb losses of the VIE that could potentially be significant to the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. Lequan and ultimately the Company hold all the variable interests of the VIE and has been determined to be the primary beneficiary of the VIE.

(c)	Use of estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported and disclosed in the consolidated financial statements and accompanying notes. Significant accounting estimates reflected in the Group’s consolidated financial statements include sales returns, inventory valuation, product warranties, share-based compensation and the valuation allowance for deferred tax assets and income tax. Actual results could differ from those estimates, and such differences may be material to the consolidated financial statements.

(d)	Foreign currency translation

The Group uses Renminbi (“RMB”) as its reporting currency. The functional currency of the Company and its subsidiaries incorporated in Hong Kong and British Virgin Islands are United States dollar (“US$”), while the functional currency of the Group’s entities in the PRC is RMB, which is their respective local currency. In the consolidated financial statements, the financial information of the Company and its subsidiary in Hong Kong and British Virgin Islands, which use US$ as their functional currency, have been translated into RMB. Assets and liabilities are translated at the exchange rates on the balance sheet date, equity amounts are translated at historical exchange rates, and revenues, expenses, and incomes are translated using the average exchange rate for the period. Translation adjustments arising from these are reported as foreign currency translation adjustments and are shown as a component of other comprehensive income in the statement of comprehensive income.

Foreign currency transactions denominated in currencies other than functional currency are translated into the functional currency using the exchange rates prevailing at the dates of the transactions. Monetary assets and liabilities denominated in foreign currencies at the balance sheet date are remeasured at the applicable rates of exchange in effect at that date. Foreign exchange gains and losses resulting from the settlement of such transactions and from remeasurement at year-end are recognized in foreign currency exchange (losses) gains, net in the consolidated statement of comprehensive income.

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

(e)	Convenience Translation

Translations of balances in the consolidated balance sheets, consolidated statements of comprehensive income and consolidated statements of cash flows from RMB into US$ as of and for the year ended December 31, 2019 are solely for the convenience of the reader and were calculated at the noon buying rate of US$1.00 = RMB6.9618 on December 31, 2019 as set forth in the H.10 statistical release of the U.S. Federal Reserve Board. No representation is made that the RMB amounts could have been, or could be, converted, realized or settled into US$ at that rate on December 31, 2019, or at any other rate.

(f)	Cash and cash equivalents

Cash includes currency on hand and deposits held by financial institutions that can be added to or withdrawn without limitation. Cash equivalents represent short-term and highly liquid investments placed with banks, and all highly liquid investments with original maturities of three months or less, which have both of the following characteristics:

Readily convertible to known amounts of cash throughout the maturity period;

ii)

So near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

(g)	Restricted cash

Cash that is restricted as to withdrawal or for use or pledged as security is reported separately on the face of the consolidated balance sheets. As the Company adopted Accounting Standards Update No. 2016-18 on January 1, 2018, restricted cash is included in the total cash and cash equivalents and restricted cash in the consolidated statements of cash flows when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Group’s restricted cash mainly represents security deposits held in designated bank accounts for issuance of bank acceptance notes.

(h)	Short-term deposits

Short-term deposits represent time deposits placed with banks with original maturities of more than three months but less than one year. Interest earned is recorded as interest income in the consolidated statement of comprehensive income during the years presented.

(i)	Short-term investments

In accordance with ASC 825, for investments in financial instruments with a variable interest rate indexed to the performance of underlying assets, the Company elected the fair value method at the date of initial recognition and carried these investments subsequently at fair value. Changes in fair values are reflected in the consolidated statements of comprehensive income.

(j)	Accounts receivable

Accounts receivable are stated at the historical carrying amount net of allowance for doubtful accounts. The Group uses specific identification in providing for bad debts when facts and circumstances indicate that collection is doubtful and a loss is probable and estimable. If the financial conditions of its customers were to deteriorate, resulting in an impairment of their ability to make payments, additional allowance may be required.

The Company maintains an allowance for doubtful accounts which reflects its best estimate of amounts that potentially will not be collected. The Company determines the allowance for doubtful accounts on an individual basis taking into consideration various factors including but not limited to historical collection experience and credit-worthiness of the debtors as well as the age of the individual receivables balance. Additionally, the Company makes specific bad debt provisions based on any specific knowledge the Company has acquired that might indicate that an account is uncollectible. The facts and circumstances of each account may require the Company to use substantial judgment in assessing its collectability.

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

(k)	Inventories

The Group procures certain key raw materials and components from suppliers and send the materials to contract manufacturers for manufacture. The Group receives the finished goods from the contract manufacturers. Therefore, inventories of the Group consist of raw materials and finished goods. Inventories are stated at the lower of cost or net realizable value. Inventory costs include expenses that are directly or indirectly incurred in the purchase, and production of manufactured product for sale. Expenses include the cost of materials, consignment manufacturing cost and other direct costs. Cost is determined using the weighted average method. The Group assesses the valuation of inventory and periodically writes down the value for estimated excess and obsolete inventory based upon the turnover and age of the products. Write downs are recorded in cost of revenues in the consolidated statements of comprehensive income.

(l)	Property, plant and equipment, net

Property, plant and equipment are carried at cost less accumulated depreciation and impairment, if any. Depreciation is calculated on a straight-line basis over the following estimated useful lives and residual value. Residual rate is determined based on the economic value of the property and equipment at the end of the estimated useful lives as a percentage of the original cost.

	Estimated useful lives	Residual rate
Computers and equipment	2-10 years	0%-5%
Vehicle	4 years	5%

Expenditures for maintenance and repairs are expensed as incurred. The gain or loss on the disposal of property and equipment is the difference between the net sales proceeds and the carrying amount of the relevant assets and is recognized in the consolidated statements of comprehensive income.

(m)	Intangible assets

Intangible assets mainly consist of software. Identifiable intangible assets are carried at acquisition cost less accumulated amortization and impairment loss, if any. Finite-lived intangible assets are tested for impairment if impairment indicators arise. Amortization of finite-lived intangible assets is computed using the straight-line method over their estimated useful lives, which are as follows:

				Estimated useful lives
Software				5 years

(n)

Leases

In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update No. 2016-02 (Topic 842) “Leases”. Topic 842 supersedes the lease requirements in Accounting Standards Codification (ASC) Topic 840, “Leases”. Under Topic 842, lessees are required to recognize assets and liabilities on the balance sheet for most leases and provide enhanced disclosures. Leases will continue to be classified as either finance or operating. The Company adopted the new standard using the optional transition method beginning January 1, 2019. As permitted under the transition guidance, the Company carried forward the assessment of whether the existing contracts contain or are leases, classification of the leases and remaining lease terms. RMB9,274 of lease assets and RMB9,168 of liabilities were recognized on the balance sheet upon adoption as of January 1, 2019.

The Company categorize leases with contractual terms longer than twelve months as either operating or finance. Finance leases are generally those leases that allow lessees to substantially utilize or pay for the entire asset over its estimated life. Assets acquired under finance leases are recorded in property and equipment, net. All other leases are categorized as operating leases. All the leases recognized by the Company were classified as operating leases for the years presented.

Lease liabilities are recognized at the present value of the fixed lease payments using a discount rate based on similarly secured borrowings available to us. Lease assets are recognized based on the initial present value of the fixed lease payments plus any direct costs from executing the leases or lease prepayments reclassified from “Prepayments and other current assets” upon lease commencement. Costs associated with operating lease assets are recognized on a straight-line basis within operating expenses over the term of the lease.

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

(o)	Revenue recognition

In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“ASU 2014-09”) and subsequently, the FASB issued several amendments which amend certain aspects of the guidance in ASC 2014-09 (ASU No. 2014-09 and the related amendments are collectively referred to as “ASC 606”). According to ASC 606, revenue is recognized when control of the promised good or service is transferred to the customers, in an amount that reflects the consideration the Group expects to be entitled to in exchange for those goods or services. The Group will enter into contracts that can include various combinations of products and services, which are generally capable of being distinct and accounted for as separate performance obligations. Revenue is recognized net of allowances for returns and any taxes collected from customers, which are subsequently remitted to governmental authorities. The Group adopted ASC 606 for all periods presented.

The Group’s revenue is primary derived from (i) IoT-enabled smart home products including smart water purification systems, smart kitchen products, and other smart products, (ii) consumable products complementary to the Group’s IoT smart home products, such as water purifier filters, (iii) other household products as well as service fees from rendering of services. Refer to Note 12 to the consolidated financial statements for disaggregation of the Group’s revenue by type of product and service for the years ended December 31, 2017, 2018 and 2019.

1)	The Group conducts its business through various contractual arrangements, the following table disaggregates the Group’s revenue by type of contract for the years ended December 31, 2017, 2018 and 2019:

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Sales to Xiaomi		739,464		1,311,852		2,112,170
—Xiaomi-branded products		654,950		1,175,332		1,859,499
—Viomi-branded products		84,514		136,520		250,593
—Rendering services		—		—		2,078
Sales to third-party customers		133,755		1,249,377		2,535,343
		873,219		2,561,229		4,647,513

Sales to Xiaomi

The Group generated a substantial portion of its revenues from sales of products to Xiaomi.

Under the cooperation agreement entered between the Group and Xiaomi, the Group is responsible for design, research, development, production and delivery of designated products using the brand name of “Xiaomi” (“Xiaomi-branded products”). Xiaomi is responsible for commercial distributions and sales. The Group also sells some Viomi-branded products to Xiaomi.

Revenue is recognized upon acceptance by this customer, which is considered at the time the control of the products is transferred to Xiaomi. Revenue does not meet the criteria to be recognized over time since 1) even if the products use “Xiaomi” brand, it does not require significant rework to make them suitable to be sold to other customers, 2) under the cooperation agreement, the Group does not have the right of payment for the work performed to date.

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

For a few types of products sold to this customer, the selling price is a fixed amount as agreed by both parties. For other types of products sold to this customer, the sales arrangement includes two installment payments. The first installment is priced to recover the costs incurred by the Group in developing, producing and shipping the products to this customer and is payable to the Group upon acceptance by the customer after delivery. The Group is also entitled to receive a potential second installment payment calculated as certain portion of the future gross profits from commercial sales made by this customer. Accordingly, the Group determines the sales price as the fixed first installment payment plus the variable second installment payment to the extent that it is probable that revenue reversal will not occur when settling with the customer subsequently. The Group estimates the variable consideration using the expected value method. In assessing the variable second installment payment, the Group takes into consideration of the historical experience with the customer, selling price of the same or similar products as at the report date as well as the recent market trend. For the years ended December 31, 2017, 2018 and 2019, net revenues earned from second installment payment arrangement represented 15.0%, 9.0% and 5.9% of total revenue from Xiaomi, respectively.

In 2019, the Group entered into a cooperation arrangement with Xiaomi related to a certain type of products. Under the arrangement, the Group acts as an agent of Xiaomi to procure suppliers without obtaining the control, risks and rewards of the products during the whole process. The Group recognizes revenue of sales on a net basis for these products.

Sales to third-party customers, including: sales to leading e-commerce platforms and offline experience stores; and sales to customers directly through the online platforms operated by Xiaomi, third parties and the Group.

- Sales to leading e-commerce platforms and offline experience stores

Pursuant to the contracts between the Group and the leading e-commerce platforms/offline experience stores (“e-commerce platforms and stores”), the e-commerce platforms and stores have legal title and physical possession of the products upon acceptance and they would bear the inventory risk of loss due to physical damage before the products are transferred and accepted by end customers. The e-commerce platforms and stores are responsible for delivering the products to end customers and can direct the use of the products and obtain the remaining benefits from the products by reselling the products. The e-commerce platforms and stores have flexibility in determining the retail sales price within relatively broad price range set by the Group. Based on these indicators, the Group determined the e-commerce platforms and stores (as opposed to the end customers) as its customers according to ASC 606-10-55-39. The Group recognizes revenue equal to the sales price to the e-commerce platforms and stores when control of the inventory is transferred.

- Sales to customers directly through the online platforms operated by Xiaomi, third parties and the Group

Under the cooperation agreements entered between the Group and online platforms, the platforms’ responsibilities are limited to offering an online marketplace, while the Group is primarily obligated in a sales transaction and takes inventory risk and has latitude in determining prices. The platforms charged the Group commission fees at pre-determined amounts or a fixed rate based on the sales amounts. Commission fees are recognized as selling expenses. The Group determined the end customers (as opposed to the platforms) as its customers and recognizes revenue equal to the sales price to the end customers when control of the inventory is transferred.

The Group provides installation service to end customers for designated Viomi-branded products without separate charge. The end customers have the right, not the obligation, to ask the Group to provide installation service. The installation service is considered being distinct and accounted for as a separate performance obligation as the products and installation services are not inputs into a combined item the end customer has contracted to receive. In addition, the Group does not provide any significant integration, modification, or customization services. It can fulfill its obligation to transfer each of the products or services separately. End customers do not always exercise their rights to ask for installation services as the installation may not be complicated and could be done by end customers themselves. Therefore, the Group expects to be entitled to a breakage amount in the contract liabilities related to installation services. The Group estimates the breakage portion based on historical customers’ requests and recognizes estimated breakage as revenue in proportion to the pattern of rights exercised by end customers. The assessment of estimated breakage would be updated on a quarterly basis. Changes in estimated breakage should be accounted for by adjusting contract liabilities to reflect the remaining rights expected to be exercised.

Judgment is required to determine standalone selling price for each distinct performance obligation. The Group allocates the arrangement consideration to the separate accounting of each distinct performance obligation based on their relative standalone selling price. The standalone selling price of the products is determined based on adjusted market assessment approach by estimating the price the customer is willing to pay for the product without installation service. For the standalone selling price of the installation services, the Group determines it by referring to actual costs charged by the third-party vendors, plus an estimated profit margin of 5% based on consideration of both company specific and relevant market factors.

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

The Group recognizes revenue for the sales to third-party customers in accordance with the applicable revenue recognition method for each of the distinct performance obligation identified. Sales of products is recognized upon acceptance by customers after delivery. Installation service is recognized when the service is rendered.

2)	Sales returns and sales incentives

- Sales to leading e-commerce platforms

The Group’s sales to leading e-commerce platforms started in 2018. As stipulated in the contracts, slow-moving goods are those unsold products after they are controlled by the e-commerce platforms for more than 30 days or 60 days or 90 days, depending on the different categories of products. The Group shall coordinate with the e-commerce platforms to sell the slowing-moving products to end customers through promotions within 30 days, otherwise, the e-commerce platforms can (i) return such slow-moving products, or (ii) sell on discount as determined by the e-commerce platforms. The Group shall bear all losses caused by such discounted sales. Based on the Group’s history of cooperation with the e-commerce platforms and the pattern that the e-commerce platforms dealt with slow-moving goods, the Group estimates that slow-moving goods will be returned to the Group instead of being sold through discounted sales by the e-commerce platforms. Under ASC 606, a right of return is not a separate performance obligation, but it affects the estimated transaction price for transferred goods. Revenue is only recognized for those products that are not expected to be returned. The estimate of expected returns should be determined in the same way as other variable consideration. Based on historical information and other relevant evidence, including the expected sales and inventory level of the e-commerce platforms, the Group assesses if it is probable there will be no significant reversal of cumulative revenue, and recognizes those sales as revenue. For the years ended December 31, 2018 and 2019, the expected sales return was RMB846 and RMB12,037. Accordingly the Group recognizes an expected return asset of RMB687 and RMB8,572, and a refund liability of RMB981 and RMB13,602 as of December 31, 2018 and 2019, respectively. The Group would update its estimate of expected returns at each period end. The expected return asset is presented and assessed for impairment separately from the refund liability. The Group would assess the expected return asset for impairment, and adjust the value of the asset if it becomes impaired.

Further, the Group might provide various consideration to the e-commerce platforms, such as gross margin guarantee, advertising and promotion fees, in the form of cash, or directly reducing amounts owed to the Group by the e-commerce platforms. The Group evaluates each type of incentives or fees to be paid in accordance with ASC 606. Considering that the Group either does not receive any service from the e-commerce platforms or cannot elect to engage another vendor to provide similar advertising services on a standalone basis, the Group reduces the transaction price for the sale of products by the amount of various consideration payable to the e-commerce platforms.

- 7 days unconditional sales return

Under the consumer protection law, end customers have an unconditional right to return the products purchased through online platforms within 7 days. The Group bases its estimates of sales return on historical results. For the years ended December 31, 2017, 2018 and 2019, the amount of sales return was insignificant. The Group may provide sales incentives in the forms of discounts to end customers through online platforms in a bundle transaction. Revenue, recognized on a net basis after such sales incentives, are allocated based on the relative standalone selling prices for respective products.

Warranty

The Group offers product warranty pursuant to standard product quality required by consumer protection law. The warranty period is calculated starting from the date when products are sold to the end customers. The Group has the obligation, at the customer’s sole discretion, to either repair or replace the defective product. The customers cannot separately purchase the warranty and the warranty doesn’t provide the customer with additional service other than assurance that the product will function as expected. Therefore, these warranties are accounted for in accordance with ASC 460 Guarantees. At the time revenue is recognized, an estimate of warranty expenses is recorded. The reserves established are regularly monitored based upon historical experience and any actual claims charged against the reserve. Warranty reserves are recorded as cost of revenues.

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

4)	Value added taxes

Value added taxes (“VAT”) on sales is calculated at 17% on revenue from products before April 30, 2018, 16% between May 1, 2018 and March 31, 2019, and 13% after April 1, 2019. The Group reports revenue net of VAT. Subsidiaries and VIEs that are VAT general tax payers are allowed to offset qualified VAT paid against their output VAT liabilities.

5)	Contract balances

Key customers, including Xiaomi and third-party customers, are entitled to a credit term. The expected length of time between the products being transferred to customers and when they pay for those products is short. There is no difference between the amount of promised consideration and the cash selling price of the promised products. Therefore, the Group concludes that the contracts with these key customers generally do not include a significant financing component. The allowance for doubtful accounts reflects the Group’s best estimate of probable losses inherent in the accounts receivable balance. The Group determines the allowance based on known troubled accounts, historical experience, and other currently available evidence. The amount of the allowance for doubtful accounts is recognized as expenses.

The opening balance of accounts receivable from these key customers as of January 1, 2018 was RMB253,896. As of December 31, 2018 and 2019, accounts and notes receivable were RMB372,702 and RMB1,026,142, respectively. During the years ended December 31, 2017, 2018 and 2019, the Group recognized impairments, net of recoveries, for accounts receivable from customers amounted to nil, nil and RMB2,006, respectively.

Contract liabilities consist of deferred revenue related to the Group’s provision of installation services, where there is still an obligation to be fulfilled by the Group. The contract liabilities will be recognized as revenue when all of the revenue recognition criteria are met.

The opening balance of deferred revenue as of January 1, 2018 was RMB146. As of December 31, 2018 and 2019, deferred revenue were RMB1,276 and RMB7,790 , respectively. During the years ended December 31, 2017, 2018 and 2019, the Group recognized revenue of installation services amounted to RMB29, RMB146 and RMB1,276, respectively, that was included in the corresponding contract liability balance at the beginning of the years. The Group expects to recognize approximately RMB7,790 of the unearned amount for the Group’s remaining performance obligations related to installation services in 2020.

During the years ended December 31, 2017, 2018 and 2019, the Group does not have any arrangement where the performance obligations have already been satisfied in the past period, but the corresponding revenue is only recognized in a later period.

(p)	Cost of revenues

Cost of revenues consists primarily of material costs, warranty, consignment manufacturing cost, salaries and benefits for staff engaged in production activities and related expenses that are directly attributable to the production of products.

(q)	Research and development expenses

Research and development expenses primarily consist of salaries and benefits as well as share-based compensation for research and development personnel, materials, general expenses and depreciation expenses associated with research and development activities.

(r)	Selling and marketing expenses

Selling and marketing expenses consist primarily of (i) advertising and market promotion expenses, (ii) shipping expenses and (iii) salaries and welfare for sales and marketing personnel. The advertising and market promotion expenses amounted to RMB39,638, RMB130,796 and RMB106,540 for the years ended December 31, 2017, 2018 and 2019. The shipping expenses amounted to RMB20,044, RMB140,456 and RMB245,329 for the years ended December 31, 2017, 2018 and 2019.

(s)	General and administrative expenses

General and administrative expenses consist primarily of (i) share-based compensation for management and administrative personnel, and (ii) salaries and welfare for general and administrative personnel.

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

(t)	Government subsidies

Government subsidies represent tax refund and government grants received from local government authorities to encourage the Group’s technology and innovation. The Group records such government subsidies as other income in the consolidated statements of comprehensive income when it has fulfilled all of its obligation related to the subsidy. The Group recorded RMB1,278, RMB1,440 and RMB35,988 of subsidy income for the years ended December 31, 2017, 2018 and 2019, respectively.

(u)	Employee benefits

PRC Contribution Plan

Full time employees of the Group in the PRC participate in a government mandated defined contribution plan, pursuant to which certain pension benefits, medical care, employee housing fund and other welfare benefits are provided to the employees. Chinese labor regulations require that the PRC subsidiary and VIEs of the Group make contributions to the government for these benefits based on certain percentages of the employees' salaries, up to a maximum amount specified by the local government. The Group has no legal obligation for the benefits beyond the contributions made. The total amounts of such employee benefit expenses, which were expensed as incurred, were approximately RMB8,016, RMB18,889 and RMB23,465 for the years ended December 31, 2017, 2018 and 2019.

(v)	Share-based compensation

Share-based compensation expenses arise from share based awards, mainly including restricted shares held by the Founder or held by the Founder on behalf of certain key management founders and share options for the purchase of ordinary shares (“Restricted Shares”). The Company accounts for share-based awards granted to the Founder and employees in accordance with ASC 718 Stock Compensation.

Before the Reorganization, the Restricted Shares held by the Founders were subject to a repurchase feature under which Xiaomi shall purchase the interest held by Founders at the original investment amount if the Founders voluntarily terminate their employment with Foshan Viomi. The Restricted Shares were classified as equity classified awards as the underlying shares of the awards are ordinary shares of Foshan Viomi and the awards do not contain any of the characteristics of liability awards described in ASC718. The Restricted Shares are accounted for as share-based compensation based on the grant date fair value over the vesting period.

After the Reorganization completed in July 2015, the repurchase feature remains, however, it became the Company’s right, and not the obligation to repurchase. With respect to the remaining unvested interest granted to the Founder on behalf of certain key management founders, the underlying shares changed from ordinary shares of Foshan Viomi to Class A ordinary shares of the Company. These shares remain to be equity classified awards as they do not contain any characteristics of a liability award and were continually accounted for as share-based compensation based on the grant date fair value over the remaining vesting period. With respect to the remaining unvested interest granted to the Founder, the underlying shares changed from ordinary shares of Foshan Viomi to redeemable Pre-IPO Class B Ordinary Shares of the Company, which are redeemable convertible shares. These awards have been reclassified as liability classified awards as the underlying Pre-IPO Class B Ordinary Shares are redeemable at a fixed price plus 6% interest per year at the option of the holder if there is no qualified IPO after a certain period of time. According to ASC718, such awards effectively consist of: (1) a liability component representing the Company’s obligation to pay the redemption price if the holder chooses to redeem, and (2) an equity component representing the fair value of the upside potential of the Pre-IPO Class B Ordinary Shares, measured using an option pricing model. At the time of the modification, the Company compared the fair value of the original award immediately before the modification, and the total fair value of the liability component and the equity component immediately after the modification. The incremental compensation amount is recognized over the remaining vesting period. The amount related to the liability component is recorded as a liability measured at the redemption price, subsequently accreted at 6% per year to reflect the increase in redemption price over time according to the terms of the Pre-IPO Class B Ordinary Shares, until the award is settled. The liability award is considered settled only upon redemption or IPO, when the Pre-IPO Class B Ordinary Shares are converted to Class A ordinary shares at which time, the redemption feature would expire.

Upon the completion of the IPO on September 25, 2018, all the Pre-IPO Class B Ordinary Shares were converted into Class B Ordinary Shares, the liability award had been settled.

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

(v)	Share-based compensation (Continued)

For share options for the purchase of ordinary shares granted to employees determined to be equity classified awards, the related share-based compensation expenses are recognized in the consolidated financial statements based on their grant date fair values which are calculated using the binomial option pricing model. The determination of the fair value is affected by the share price as well as assumptions regarding a number of complex and subjective variables, including the expected share price volatility, actual and projected employee share option exercise behavior, risk-free interest rates and expected dividends. The fair value of the ordinary shares is assessed using the income approach/discounted cash flow method, with a discount for lack of marketability, given that the shares underlying the awards were not publicly traded at the time of grant. Share-based compensation expenses are recorded net of estimated forfeitures using graded-vesting method during the service period requirement, such that expenses are recorded only for those share-based awards that are expected to ultimately vest.

(w)	Income taxes

Current income taxes are provided on the basis of net income for financial reporting purposes, adjusted for income and expense items which are not assessable or deductible for income tax purposes, in accordance with the regulations of the relevant tax jurisdictions. Deferred income taxes are accounted for using an asset and liability method. Under this method, deferred income taxes are recognized for the tax consequences of temporary differences by applying enacted statutory rates applicable to future years to differences between the financial statement carrying amounts and the tax bases of existing assets and liabilities. The tax base of an asset or liability is the amount attributed to that asset or liability for tax purpose. The effect on deferred taxes of a change in tax rates is recognized in statement of comprehensive income in the period of change. A valuation allowance is provided to reduce the amount of deferred tax assets if it is considered more likely than not that some portion of, or all of the deferred tax assets will not be realized.

Uncertain tax positions

The guidance on accounting for uncertainties in income taxes prescribes a more likely than not threshold for financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. Guidance was also provided on the recognition of income tax assets and liabilities, classification of current and deferred income tax assets and liabilities, accounting for interest and penalties associated with tax positions, accounting for income taxes in interim periods, and income tax disclosures. Significant judgment is required in evaluating the Group’s uncertain tax positions and determining its provision for income taxes. The Group recognizes interests and penalties, if any, under accrued expenses and other current liabilities on its balance sheet and under other expenses in its statement of comprehensive income. The Group did not recognize any interest and penalties associated with uncertain tax positions for the years ended December 31, 2017, 2018 and 2019. As of December 31, 2018 and 2019, the Group did not have any significant unrecognized uncertain tax positions.

(x)	Comprehensive income

Comprehensive income consists of two components, net income and other comprehensive income, net of tax. Other comprehensive income refers to revenue, expenses, and gains and losses that are recorded as an element of shareholders’ equity but are excluded from net income. The Group’s other comprehensive income consists of foreign currency translation adjustments from its entities not using the RMB as their functional currency. Comprehensive income is reported in the consolidated statements of comprehensive income.

(y)	Statutory reserves

The Company's subsidiaries and VIEs established in the PRC are required to make appropriations to certain non-distributable reserve funds.

In accordance with the laws applicable to the Foreign Investment Enterprises established in the PRC, the Company's subsidiaries registered as wholly-owned foreign enterprise have to make appropriations from their annual after-tax profits (as determined under generally accepted accounting principles in the PRC(“PRC GAAP”)) to reserve funds including general reserve fund, enterprise expansion fund and staff bonus and welfare fund. The appropriation to the general reserve fund must be at least 10% of the annual after-tax profits calculated in accordance with PRC GAAP. Appropriation is not required if the general reserve fund has reached 50% of the registered capital of the company. Appropriations to the enterprise expansion fund and staff bonus and welfare fund are made at the respective company's discretion.

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

(y)	Statutory reserves (Continued)

In addition, in accordance with the PRC Company Laws, the Group's VIEs registered as Chinese domestic company must make appropriations from its annual after-tax profits as determined under the PRC GAAP to non-distributable reserve funds including statutory surplus fund and discretionary surplus fund. The appropriation to the statutory surplus fund must be 10% of the annual after-tax profits as determined under PRC GAAP. Appropriation is not required if the statutory surplus fund has reached 50% of the registered capital of the company. Appropriation to the discretionary surplus fund is made at the discretion of the company.

The use of the general reserve fund, enterprise expansion fund, statutory surplus fund and discretionary surplus fund are restricted to offsetting of losses or increasing of the registered capital of the respective company. The staff bonus and welfare fund is a liability in nature and is restricted to fund payments of special bonus to employees and for the collective welfare of all employees. None of these reserves are allowed to be transferred to the Company in terms of cash dividends, loans or advances, nor can they be distributed except under liquidation.

During the year ended December 31, 2017, 2018 and 2019, appropriations to statutory reserve funds amounted to RMB6,250, nil and RMB1,047, respectively. Statutory reserve funds amounting to RMB6,250 and RMB7,297 were recognized in additional paid-in capital as of December 31, 2018 and 2019, respectively.

(z)	Income per share

Basic income per share is computed by dividing net income attributable to ordinary shareholders, considering the accretion of redemption feature and cumulative dividend related to the Company’s redeemable convertible preferred shares and Pre-IPO Class B Ordinary Shares, and undistributed earnings allocated to redeemable convertible preferred shares, Pre-IPO Class B Ordinary Shares and unvested Class A ordinary shares as unvested Class A ordinary shares are also entitled to participating dividends, by the weighted average number of ordinary shares outstanding during the period using the two-class method. Under the two-class method, net income is allocated between ordinary shares and other participating securities based on their participating rights. Net losses are not allocated to other participating securities if based on their contractual terms they are not obligated to share the losses. After the IPO, net income per ordinary share are computed on Class A ordinary shares and Class B Ordinary Shares together, because both classes have the same dividend rights in the Company’s undistributed net income.

Diluted income per share is calculated by dividing net income attributable to ordinary shareholders, as adjusted for the effect of dilutive ordinary equivalent shares, if any, by the weighted average number of ordinary and dilutive ordinary equivalent shares outstanding during the period. Ordinary equivalent shares consist of ordinary shares issuable upon the conversion of the redeemable convertible preferred and Pre-IPO Class B Ordinary Shares, using the if-converted method, and shares issuable upon the exercise of share options using the treasury stock method. Ordinary equivalent shares are not included in the denominator of the diluted income per share calculation when inclusion of such shares would be anti-dilutive.

(aa)	Related parties

Parties are considered to be related if one party has the ability, directly or indirectly, to control the other party or exercise significant influence over the other party in making financial and operating decisions. Parties are also considered to be related if they are subject to common control or significant influence, such as a family member or relative, shareholder, or a related corporation.

(bb)	Segment reporting

Based on the criteria established by ASC 280 “Segment Reporting”, the Group's chief operating decision maker has been identified as the Chairman of the Board of Directors/CEO, who reviews consolidated results of the Group when making decisions about allocating resources and assessing performance. The Group has internal reporting of revenue, cost and expenses by nature as a whole. Hence, the Group has only one operating segment. The Company is domiciled in the Cayman Islands while the Group mainly operates its businesses in the PRC and earns substantially all of the revenues from external customers attributed to the PRC.

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

(cc)	Recently issued accounting pronouncements

In June 2016, the FASB issued ASU 2016-13: Financial Instruments-Credit Losses (Topic 326), which requires entities to measure all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. This replaces the existing incurred loss model and is applicable to the measurement of credit losses on financial assets measured at amortized cost. This guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The Company will adopt the new standard in the first fiscal quarter of 2020. Based on management’s assessment, the adoption of ASU 2016-13 does not have a material impact on the Company’s consolidated financial statements.

In August 2018, the FASB issued ASU 2018-13, Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in this standard will remove, modify and add certain disclosures under ASC Topic 820, Fair Value Measurement, with the objective of improving disclosure effectiveness. ASU 2018-13 will be effective for the Group’s fiscal year beginning January 1, 2020, with early adoption permitted. The transition requirements are dependent upon each amendment within this update and will be applied either prospectively or retrospectively. The Company does not expect that the adoption of ASU 2018-13 will have a material impact to the Company’s consolidated financial statements.

Concentration and Risks

12 Months Ended

Dec. 31, 2019

Risks And Uncertainties [Abstract]

CONCENTRATION AND RISKS

3.	CONCENTRATION AND RISKS

(a)	Foreign exchange risk

The revenues and expenses of the Group’s entities in the PRC are generally denominated in RMB and their assets and liabilities are denominated in RMB. The RMB is not freely convertible into foreign currencies. Remittances of foreign currencies into the PRC or remittances of RMB out of the PRC as well as exchange between RMB and foreign currencies require approval by foreign exchange administrative authorities and certain supporting documentation. The State Administration for Foreign Exchange, under the authority of the People’s Bank of China, controls the conversion of RMB into other currencies.

(b)	Credit risk

Financial instruments that potentially expose the Group to credit risk consist primarily of cash and cash equivalents, restricted cash, short-term investments, short-term deposits, accounts and notes receivable and amounts due from related parties. The Group places its cash and cash equivalents, restricted cash, short-term investments and short-term deposits with financial institutions with high credit ratings and quality. There has been no recent history of default in relation to these financial institutions and credit risk is immaterial.

The Group conducts credit evaluations of third-party customers and related parties, and generally does not require collateral or other security from its third-party customers and related parties. The Group establishes an allowance for doubtful accounts primarily based upon the age of the receivables and factors surrounding the credit risk of specific third-party customers and related parties.

Accounts and notes receivable from third parties concentration of credit risk as below:

	As of December 31,
	2018				2019
	RMB				RMB
Company A		58,766	53	%		174,620	55	%
Company B		36,734	33	%		109,585	35	%

3.	CONCENTRATION AND RISKS (Continued)

(b)	Credit risk (Continued)

Accounts receivable from a related party concentration of credit risk as below:

	As of December 31,
	2018			2019
	RMB			RMB
Xiaomi		260,984	100%		707,947	100%

Other receivables from related parties concentration of credit risk as below:

	As of December 31,
	2018				2019
	RMB				RMB
Xiaomi		112,320	100	%		23,944	100	%

(c)	Revenue concentration risk

	Year ended December 31,
	2017				2018				2019
	RMB				RMB				RMB
Xiaomi		739,464	85	%		1,311,852	51	%		2,112,170	45	%

The revenue generated from Xiaomi included sale of both Xiaomi-branded and Viomi-branded products. Revenue from sale of Viomi-branded products amounted to RMB84,514, RMB136,520 and RMB250,593 for the years ended December 31, 2017, 2018 and 2019, respectively.

Cash and Cash Equivalents

12 Months Ended

Dec. 31, 2019

Cash And Cash Equivalents [Abstract]

Cash and Cash Equivalents

4.	CASH AND CASH EQUIVALENTS

Cash and cash equivalents represent cash on hand and demand deposits placed with banks or other financial institution. Cash and cash equivalents balance as of December 31, 2018 and 2019 primarily consist of the following currencies:

	As of December 31, 2018				As of December 31, 2019
			RMB				RMB
	Amount		equivalent		Amount		equivalent
RMB		332,702		332,702		569,772		569,772
US$		88,529		607,596		57,720		402,666
Total				940,298				972,438

Restricted Cash

12 Months Ended

Dec. 31, 2019

Cash And Cash Equivalents [Abstract]

RESTRICTED CASH

5.RESTRICTED CASH

As of December 31, 2018 and 2019, the Group held restricted cash of RMB29,550 and RMB30,567 respectively in designated bank accounts for issuance of bank acceptance notes.

Short-Term Deposits

12 Months Ended

Dec. 31, 2019

Schedule Of Short Term Deposits [Abstract]

SHORT-TERM DEPOSITS

6.	SHORT-TERM DEPOSITS

Short-term deposits balance as of December 31, 2018 and 2019 is primarily denominated in RMB.

Short-Term Investments

12 Months Ended

Dec. 31, 2019

Schedule Of Investments [Abstract]

SHORT-TERM INVESTMENTS

7.	SHORT-TERM INVESTMENTS

Short-term investments represent structured deposits with maturities of less than one year. Short-term investments balance as of December 31, 2018 and 2019 is primarily denominated in the following currencies:

	As of December 31, 2018				As of December 31, 2019
			RMB				RMB
	Amount		equivalent		Amount		equivalent
US$		10,049		68,971		25,087		175,012
RMB		100,022		100,022		141,189		141,189
Total				168,993				316,201

Inventories

12 Months Ended

Dec. 31, 2019

Inventory Disclosure [Abstract]

INVENTORIES

8.	INVENTORIES

Inventories consisted of the followings:

	As of December 31,
	2018		2019
	RMB		RMB
Finished goods		136,494		232,671
Raw materials		95,481		185,344
Inventories		231,975		418,015

For the years ended December 31, 2017, 2018 and 2019, the Group recorded write-down of RMB81, RMB1,059 and RMB15,661 for obsolete inventories.

Prepaid Expenses and Other Assets

12 Months Ended

Dec. 31, 2019

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

PREPAID EXPENSES AND OTHER ASSETS

9.	PREPAID EXPENSES AND OTHER ASSETS

	As of December 31,
	2018			2019
	RMB			RMB
Advances to suppliers		23,549			43,175
Expected return assets		687			11,212
Other receivables		15,361			7,725
Lease hold improvement		206			6,825
Prepayment for equipment		3,430			4,345
Other current assets		7,293			202
Total		50,526			73,484
Less: non-current portion		(3,636	)		(11,170	)
Prepaid expenses and other assets-current portion		46,890			62,314

Property, Plant and Equipment, Net

12 Months Ended

Dec. 31, 2019

Property Plant And Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT, NET

10.	PROPERTY, PLANT AND EQUIPMENT, NET

Property, plant and equipment, net consisted of the following:

	As of December 31,
	2018			2019
	RMB			RMB
Computers and equipment		16,270		87,374
Vehicle		508		508
Total		16,778		87,882
Less: accumulated depreciation		(5,477	)	(20,589)
Property, plant and equipment, net		11,301		67,293

The Group had recorded depreciation expense of RMB1,680, RMB2,244 and RMB15,427 for the years ended December 31, 2017, 2018 and 2019, respectively. No impairment was recorded for the years ended December 31, 2017, 2018 and 2019.

Accrued Expenses and Other Liabilities

12 Months Ended

Dec. 31, 2019

Payables And Accruals [Abstract]

ACCRUED EXPENSES AND OTHER LIABILITIES

11.	ACCRUED EXPENSES AND OTHER LIABILITIES

	As of December 31,
	2018			2019
	RMB			RMB
Accrued payroll and welfare		39,700			69,269
Freight payable		50,680			63,084
Other tax payable		42,076			45,217
Product warranty		12,744			22,463
Installation fee payables		8,133			21,850
Marketing and promotion expenses		10,710			19,223
Refund liabilities		981			18,088
Professional fee payables		10,340			10,699
Deferred revenue		1,276			7,790
Other current liabilities		24,808			49,154
Total		201,448			326,837
Less: non-current portion		(518	)		(1,795	)
Accrued expenses and other liabilities-current portion		200,930			325,042

Product warranty activities were as follows:

	Product Warranty
	RMB
Balance at December 31, 2017		13,909
Provided during the year		19,775
Utilized during the year		(20,940	)
Balance at December 31, 2018		12,744
Provided during the year		52,275
Utilized during the year		(42,556	)
Balance at December 31, 2019		22,463

Revenue

12 Months Ended

Dec. 31, 2019

Revenue From Contract With Customer [Abstract]

REVENUE

12.

REVENUE

	Year ended December 31
	2017		2018		2019
	RMB		RMB		RMB
Sales of product
- IoT-enabled smart home products		712,317		2,081,273		3,587,355
- Consumable products		87,500		141,940		265,844
- Other products		72,686		323,381		741,290
Total of sales of product		872,503		2,546,594		4,594,489
Rendering of services		716		14,635		53,024
Total		873,219		2,561,229		4,647,513

Income Tax Expenses

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

INCOME TAX EXPENSES

13.INCOME TAX EXPENSES

Cayman Islands

Under the current tax laws of Cayman Islands, the Company and its subsidiaries are not subject to tax on income or capital gains. Besides, upon payment of dividends by the Company to its shareholders, no Cayman Islands withholding tax will be imposed.

Hong Kong

Under the current Hong Kong Inland Revenue Ordinance, the subsidiary of the Group in Hong Kong are subject to 8.25% and 16.5% Hong Kong profit tax on its taxable income within HKD$2 million and beyond HKD$2 million respectively, generated from operations in Hong Kong. Additionally, payments of dividends by the subsidiary incorporated in Hong Kong to the Company are not subject to any Hong Kong withholding tax.

PRC

In accordance with the Enterprise Income Tax Law (“EIT Law”), Foreign Investment Enterprises (“FIEs”) and domestic companies are subject to Enterprise Income Tax (“EIT”) at a uniform rate of 25%. The subsidiaries and VIEs of the Group in the PRC are subject to a uniform income tax rate of 25% for years presented except for the entity which was qualified to certified High and New Technology Enterprises (“HNTE”) that are entitled to a favorable statutory tax rate of 15%. According to a policy promulgated by the State Tax Bureau of the PRC and effective from 2008 onwards, enterprises engaged in research and development activities are entitled to claim an additional tax deduction amounting to 50% of the qualified research and development expenses incurred in determining its tax assessable profits for that year. The additional tax deduction has been increased from 50% of the qualified research and development expenses to 75%, effective from 2018 to 2020, according to a new tax incentives policy promulgated by the State Tax Bureau of the PRC in September 2018 (“Super Deduction”).

Withholding tax on undistributed dividends

Under the CIT Law and its implementation rules, the profits of a foreign-invested enterprise arising in 2008 and thereafter that are distributed to its immediate holding company outside the PRC are subject to withholding tax at a rate of 10%. A lower withholding tax rate will be applied if there is a beneficial tax treaty between the PRC and the jurisdiction of the foreign holding company. A holding company in Hong Kong, for example, will be eligible, with approval of the PRC local tax authority, to be subject to a 5% withholding tax rate under the Arrangement Between the PRC and the Hong Kong Special Administrative Region on the Avoidance of Double Taxation and Prevention of Fiscal Evasion with Respect to Taxes on Income and Capital if such holding company is considered to be a non-PRC resident enterprise and holds at least 25% of the equity interests in the PRC foreign-invested enterprise distributing the dividends. However, if the Hong Kong holding company is not considered to be the beneficial owner of such dividends under applicable PRC tax regulations, such dividend will remain subject to withholding tax at a rate of 10%. Aggregate undistributed earnings of the Group entities located in the PRC that are available for distribution to the Company as of December 31, 2018 and 2019 are approximately RMB282,130 and RMB598,503, respectively. The Company does not intend to have any of its subsidiaries located in PRC distribute any undistributed earnings of such subsidiaries in the foreseeable future, but rather expects that such earnings will be reinvested by such subsidiaries for their PRC daily operations. Accordingly, no withholding tax was recorded as of December 31, 2018 and 2019.

13.	INCOME TAX EXPENSES (Continued)

Composition of income tax expense

The current and deferred components of income taxes appearing in the consolidated statements of comprehensive income are as follows:

	Year ended December 31,
	2017			2018			2019
	RMB			RMB			RMB
Current tax expenses		15,519			26,247			52,232
Deferred tax benefit		(801	)		(2,186	)		(7,042	)
Income tax expenses	14,718			24,061			45,190

Reconciliation between the income tax expenses computed by applying the PRC enterprise tax rate to income before income taxes and actual provision were as follows:

	Year ended December 31,
	2017			2018			2019
	RMB			RMB			RMB
Income from operations in the PRC		106,868			93,910			321,090
Income (loss) from overseas entities		1,090			(4,499	)		17,930
Income before income tax		107,958			89,411			339,020

Tax expense at PRC enterprise income tax rate of 25%		26,990			22,353			84,755
Income tax on tax holiday⁽¹⁾		(10,989	)		(9,632	)		(31,493	)
Tax effect of permanence differences⁽²⁾		(2,640	)		(7,871	)		(12,147	)
Change in valuation allowance⁽³⁾		760			602			1,592
Effect of share-based compensation		873			17,492			6,475
Effect of income tax in jurisdictions other than the PRC		(276	)		1,117			(3,992	)
Income tax expenses		14,718			24,061			45,190

(1)

The income tax on tax holidays represents the effect of preferential income tax rate that Foshan Viomi qualified as an HNTE is entitled to enjoy the beneficial tax rate of 15% for the three years ended December 31, 2017, 2018 and 2019. Foshan Viomi will need to re-apply for HNTE qualification renewal in 2022.

(2)

The permanent book-tax differences mainly consisted of R&D super deductions.

(3)

Valuation allowance for the years ended December 31, 2017, 2018 and 2019 are related to the deferred tax assets of certain group entities which reported loss. The Group believed that it is more likely than not that these the deferred tax assets of these entities will not be utilized. Therefore, valuation allowance has been provided.

The per share effect of the tax holidays are as follows:

	Year ended December 31,
	2017	2018		2019
	RMB	RMB		RMB
Net income per share effect – basic	0.53	0.22		0.13
Net income per share effect – diluted	0.41		0.20	0.13

13.	INCOME TAX EXPENSES (Continued)

Deferred tax assets and deferred tax liabilities

The significant components of the Group’s deferred tax assets were as follows:

	As of December 31,
	2018			2019
	RMB			RMB
Accrued expenses and others		4,616			9,245
Net operating loss carry forwards		1,560			3,511
Inventory write downs		421			1,497
Deferred income		191			1,169
Total deferred tax assets		6,788			15,422
Less: valuation allowance		(1,554	)		(3,146	)
Deferred tax assets, net		5,234			12,276

Movement of valuation allowance

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Balance at beginning of the year		192		952		1,554
Provided		760		602		1,592
Balance at end of the year		952		1,554		3,146

Uncertain tax positions

The Group evaluates the level of authority for each uncertain tax position (including the potential application of interest and penalties) based on the technical merits, and measures the unrecognized benefits associated with the tax positions. As of December 31, 2018 and 2019, the Group did not have any significant unrecognized uncertain tax positions.

According to the PRC Tax Administration and Collection Law, the statute of limitations is generally three years and can be extended to five years under special circumstances.

Ordinary Shares

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

ORDINARY SHARES

14.	ORDINARY SHARES

The Company’s original Memorandum and Articles of Association authorizes the Company to issue 346,545,454 class A ordinary shares with a par value of US$0.0001 per share. As of December 31, 2017, the Company had 25,363,636 class A ordinary shares outstanding. Each ordinary share is entitled to one vote. The holders of ordinary shares are also entitled to receive dividends whenever funds are legally available and when declared by the Board of Directors, subject to prior rights of holders of all other classes of shares outstanding.

On August 23, 2018, the Company issued 4,000,000 class A ordinary shares at par value to Mr. Chen’s wholly-owned entity Viomi Limited to award his contribution to the Company’s development. Such shares were immediately vested. The issuance of such shares is accounted for as a share-based compensation to Mr. Chen. The issuance date fair value was estimated to be approximately US$3.30 per share.

On the same day, the Company effected a share split whereby each of the Company’s then authorised and outstanding ordinary shares and preferred shares, par value of $0.0001 each, was divided into ten ordinary shares and preferred shares of the same series, par value US$0.00001 each, respectively. All shareholders then surrendered 90% of their after-share-split outstanding shares back to the Company for cancellation. After the share split and the surrender of shares for cancellation, the number of the Company’s outstanding ordinary and preferred shares remained unchanged. The par value per ordinary share has been retroactively revised as if it had been adjusted in proportion to the share split.

14.	ORDINARY SHARES (Continued)

Pursuant to the resolution of the shareholders of the Company on August 23, 2018, the Company’s authorized share capital became US$50,000 divided into 5,000,000,000 shares comprising of the (i) 4,800,000,000 Class A Ordinary Shares of a par value of US$0.00001 each, (ii) 150,000,000 Class B Ordinary Shares of a par value of US$0.00001 each and (iii) 50,000,000 shares of a par value of US$0.00001 each of such class or classes (however designated) as the board of directors may determine in accordance with post-offering amended and restated memorandum and articles of association. Holders of Class A Ordinary Shares and Class B Ordinary Shares have the same rights, except for voting rights and conversion rights. Each Class A Ordinary Share is entitled to one vote, and each Class B Ordinary Share is entitled to ten (10) votes, voting together as one class. Each Class B Ordinary Share is convertible into one Class A Ordinary Share at any time by the holder thereof. Class A Ordinary Shares are not convertible into Class B Ordinary Shares under any circumstances. Upon any transfer of Class B Ordinary Shares by a holder to any person or entity other than holders of Class B Ordinary Shares or their affiliates, such Class B Ordinary Shares shall be automatically and immediately converted into the equivalent number of Class A Ordinary Shares.

Upon the completion of the Company's IPO in 2018, 34,200,000 Class A Ordinary Shares were issued and 18,181,818 Series A Preferred Shares have been converted into Class A Ordinary Shares.

As of December 31, 2018, the Company had 90,200,000 Class A Ordinary Shares and 117,600,000 Class B Ordinary Shares outstanding, respectively.

During the year ended December 31, 2019, 1,494,732 Class A Ordinary Shares were issued for the exercised share options. In addition, 6,750,000 Class B Ordinary Shares were converted into Class A Ordinary Shares.

As of December 31, 2019, the Company had 98,444,732 Class A Ordinary Shares and 110,850,000 Class B Ordinary Shares outstanding, respectively.

Redeemable Convertible Preferred and Pre-IPO Class B Ordinary Shares

12 Months Ended

Dec. 31, 2019

Temporary Equity Disclosure [Abstract]

REDEEMABLE CONVERTIBLE PREFERRED AND PRE-IPO CLASS B ORDINARY SHARES

15.	REDEEMABLE CONVERTIBLE PREFERRED AND PRE-IPO CLASS B ORDINARY SHARES

As described in note1 (a), pursuant to a shares purchase agreement, the Company issued Pre-IPO Class B Ordinary Shares to Mr. Chen, Red Better and Shunwei during the Reorganization, and the Company also issued totaling 18,181,818 shares (with par value of US$0.0001) of Series A Preferred Shares for US$1.1000 per share with total consideration of US$20,000, including conversion of the outstanding bridge loans of US$5,250.

The significant terms of the Series A Preferred Shares and Pre-IPO Class B Ordinary Shares issued by the Company are as follows:

Conversion rights

Optional Conversion

Each holder of Series A Preferred Shares and Pre-IPO Class B Ordinary Shares shall have the right, at such holder’s sole discretion, to convert all or any portion of the Series A Preferred Shares and Pre-IPO Class B Ordinary Shares into Class A Ordinary Shares at any time. The conversion rate for Series A Preferred Shares and Pre-IPO Class B Ordinary Shares shall be determined by dividing applicable Share Issue Price by the conversion price then in effect at the date of the conversion. The initial conversion price will be the applicable Share Issue Price (i.e., a 1-to-1 initial conversion ratio), and thereafter shall be subject to adjustment and readjustment from time to time as hereinafter provided, being no less than par value. Adjustments of conversion ratios include the following:

(1)

Adjustment of applicable conversion price upon issuance of additional ordinary shares below the applicable conversion price.

(2)

Adjustments for share dividends, subdivisions, combinations or consolidations of class A ordinary shares.

15.	REDEEMABLE CONVERTIBLE PREFERRED AND PRE-IPO CLASS B ORDINARY SHARES (Continued)

(3)

Adjustments for other distributions.

(4)

Adjustments for reclassification, exchange and substitution.

Automatic Conversion

Each Series A Preferred Share and Pre-IPO Class B Ordinary Share shall automatically be converted into class A ordinary shares, at the then applicable preferred share conversion price upon the closing of a Qualified IPO;

Voting rights

Each Series A Preferred Share and Pre-IPO Class B Ordinary Share shall carry a number of votes equal to the number of class A ordinary shares then issuable upon its conversion into class A ordinary shares at the record date for determination of the shareholders entitled to vote on such matters, or, if no such record date is established, at the date such vote is taken or any written consent of shareholders is solicited. To the extent that applicable law, Memorandum and Articles of the Company require the Series A Preferred Shares and Pre-IPO Class B Ordinary Shares to vote separately as a class with respect to any matters, the Series A Preferred Shares and Pre-IPO Class B Ordinary Shares shall vote separately as a class with respect to such matters. Otherwise, the holders of Series A Preferred Shares and Pre-IPO Class B Ordinary Shares and class A ordinary shares shall vote together as a single class.

Redemption rights

Redemption Condition for Series A Preferred Shares and Pre-IPO Class B Ordinary Shares:

The Series A Preferred Shares and Pre-IPO Class B Ordinary Shares are redeemable at any time after the earlier of:

the fifth anniversary of the date on which the closing of the shares issuance pursuant to the share purchase agreement (the “Closing Date”), if the Company has not consummated a Qualified IPO;

ii)

any material breach by the Founder or the Group, of any representatives, warranties or covenants of the transaction documents and not cured within six (6) months (the “Redemption Start Date”), then subject to the applicable laws of the Cayman Islands and, if so requested by any investor, the Company and the Founder shall redeem all or part of the outstanding Series A Preferred Shares and/or Pre-IPO Class B Ordinary Shares held by such Investor (collectively, the “Redeemable Shares”) in cash out of funds legally available therefor.

The redemption price of each Series A Preferred Share and Pre-IPO Class B Ordinary Share shall be the sum of the Series A Preferred Shares and Pre-IPO Class B Ordinary Shares issuance price, respectively: Plus 6% compound interest return per annum on the issuance price; plus all declared but unpaid dividends per Series A Preferred Shares and Pre-IPO Class B Ordinary Shares.

If the Company does not have sufficient cash or funds legally available to redeem any of the redeemable shares required to be redeemed, the Company and the Founder shall use their best effort to cause the remaining redeemable shares to be purchased, including without limitation, to seek, facilitate and procure third parties to acquire the remaining redeemable shares on terms and conditions acceptable to the relevant redemption holders.

Dividends rights

Holders of outstanding Series A Preferred Shares shall be entitled to receive dividends, out of any assets legally available therefor, prior and in preference to any declaration or payment of any dividend (whether in cash, in property or in shares of the capital of the Company) on the ordinary shares or any other class or series of shares of the Company, at the rate of eight percent (8%) of the preferred share issue price per share (as adjusted for any subdivisions, consolidations, bonus issues, reclassifications and the like) per annum on each Series A Preferred Shares, payable in U.S. dollars and annually when, as and if declared by the Board. Such distributions shall be cumulative. Holders of the Series A Preferred Shares shall also be entitled to receive any non-cash dividends declared by the Board on an as-converted basis.

After payment of the dividends distributed to the holders of Series A Preferred Shares, any additional dividends or distributions shall be distributed to the holders of Pre-IPO Class B Ordinary Shares, prior and in preference to any declaration or payment of any dividend (whether in cash, in property or in shares of the capital of the Company) on the class A ordinary shares or any other class or series of shares of the Company, at the rate of eight percent (8%) of the deemed Pre-IPO Class B Ordinary Share issue price per share (as adjusted for any subdivisions, consolidations, bonus issues, reclassifications and the like) per annum on each Pre-IPO Class B Ordinary Share, payable in U.S. dollars and annually when, as and if declared by the Board. Such distributions shall be cumulative. Holders of the Pre-IPO Class B Ordinary Shares shall also be entitled to receive any non-cash dividends declared by the Board on an as-converted basis.

15.	REDEEMABLE CONVERTIBLE PREFERRED AND PRE-IPO CLASS B ORDINARY SHARES (Continued)

Liquidation rights

Liquidation Preferences

In the event of any liquidation, dissolution or winding up of the Company, either voluntary or involuntary, all assets and funds of the Company legally available for distribution among holders of the outstanding Shares (on an as-converted to basis) in the following order and manner:

the holders of the Series A Preferred Shares shall be entitled to receive, prior to any distribution to the holders of the ordinary shares or any other class or series of shares then outstanding, an amount per Series A Preferred Share equal to (a) one hundred and fifty percent (150%) of the preferred share issue price, plus (b) all declared but unpaid dividends thereon (collectively, the “Preferred Share Preference Amount”). If the Company has insufficient assets to permit payment of the Preferred Share Preference Amount in full to all holders of Series A Preferred Shares, then the assets of the Company shall be distributed ratably to the holders of the Series A Preferred Shares in proportion to the full Preferred Share Preference Amount.

ii)

after the full Preferred Share Preference Amount on all outstanding Series A Preferred Shares has been paid, any remaining funds or assets of the Company legally available for distribution to shareholders shall be distributed to the holders of Pre-IPO Class B Ordinary Shares, prior to the holders of the class A ordinary shares or any other class or series of shares then outstanding, an amount per Pre-IPO Class B Ordinary Share equal to (a) one hundred and fifty percent (150%) of the deemed Pre-IPO Class B Share issue price, plus (b) all declared but unpaid dividends thereon (collectively, the “Class B Share Preference Amount”, collectively with the Preferred Share Preference Amount, the “Preference Amount”). After the full Preferred Share Preference Amount has been paid, if the remaining assets are insufficient to permit payment of the Class B Share Preference Amount in full to all holders of Pre-IPO Class B Ordinary Shares, then the remaining assets of the Company shall be distributed ratably to the holders of the Pre-IPO Class B Ordinary Shares in proportion to the full Class B Share Preference Amount.

iii)

after the full Preference Amount on all outstanding Series A Preferred Shares and Pre-IPO Class B Ordinary Shares has been paid, any remaining funds or assets of the Company legally available for distribution to shareholders shall be distributed on a pro rata, pari passu basis among the holders of the Preferred Shares (on an as-converted basis), together with the holders of the Ordinary Shares.

Liquidation Event

The following events shall be deemed as a liquidation, dissolution or winding up of the Company (each, a “Liquidation Event”):

(i)

any acquisition of the Company (whether by a sale of equity, merger or consolidation) in which in excess of 50% of the Company’s voting power outstanding before such transaction is transferred;

(ii)

a sale of all or substantially all of the Company’s assets and no substantial business operations will be continued by the Company.

Accounting of Series A Preferred Shares and Pre-IPO Class B Ordinary Shares

The Company classified the Series A Preferred Shares and Pre-IPO Class B Ordinary Shares as mezzanine equity in the consolidated balance sheets because they were redeemable at the holders’ option any time after a certain date and were contingently redeemable upon the occurrence of certain liquidation events outside of the Company’s control. The Series A Preferred Shares and Pre-IPO Class B Ordinary Shares are recorded initially at fair value, net of issuance costs.

Prior to the Reorganization, the 40% initial equity interests of Foshan Viomi held by the Founder for himself has liquidation preference, and the 40% initial equity interests of Foshan Viomi held by Tianjin Jinxing has liquidation preference and also becomes redeemable in the event of a breach of contract by Foshan Viomi.

Upon completion of the Reorganization, both the Founder and Tianjin Jinxing’s equity interests in Foshan Viomi are exchanged into 67,636,364 Pre-IPO Class B Ordinary Shares of the Company, respectively. After the Reorganization, the most significant change in the provision is the addition of redemption clause which allows the holders of the Pre-IPO Class B Ordinary Shares to redeem the Pre-IPO Class B Ordinary Shares if there are no Qualified IPO after the fifth anniversary of the Closing Date.

15.	REDEEMABLE CONVERTIBLE PREFERRED AND PRE-IPO CLASS B ORDINARY SHARES (Continued)

This transaction was considered as an extinguishment of the previous equity interests and therefore, the Pre-IPO Class B Ordinary Shares are measured at its fair value on the extinguishment date.

The Group recognizes changes in the redemption value ratable over the redemption period. Increases in the carrying amount of the redeemable preferred shares are recorded by charges against retained earnings, or in the absence of retained earnings, by charges as reduction of additional paid-in capital until additional paid-in capital is reduced to zero. Once additional paid-in capital is reduced to zero, the redemption value measurement adjustment is recognized as an increase in accumulated deficit.

The change in the balance of Series A Preferred Shares and Pre-IPO Class B Ordinary Shares included in mezzanine equity for the years ended December 31, 2017 and 2018 are as follows:

	Series A Preferred Shares			Pre-IPO Class B Ordinary Shares held by the Founder⁽¹⁾⁽²⁾			Pre-IPO Class B Ordinary Shares- owned by Xiaomi⁽¹⁾			Total
	RMB			RMB			RMB			RMB
Balance as of January 1, 2017		151,279			54,545			218,175			423,999
Accretion of preferred shares		8,834			—			—			8,834
Foreign exchange		(9,068	)		(3,169	)		(12,668	)		(24,905	)
Balance as of December 31, 2017		151,045			51,376			205,507			407,928
Accretion of preferred shares		6,563			—			—			6,563
Foreign exchange		7,487			2,437			9,743			19,667
Conversion of Series A Preferred Shares and Pre- IPO Class B Ordinary Shares to ordinary shares upon the completion of the IPO on September 25, 2018		(165,095	)		(53,813	)		(215,250	)		(434,158	)
Balance as of December 31, 2018		—			—			—			—

(1)

The carrying amount of Pre-IPO Class B Ordinary Shares is higher than the redemption value, which is based on the original investment amount in 2014. Therefore no accretion was recorded for the years ended December 31, 2017 and 2018.

(2)

Out of the 67,636,364 Pre-IPO Class B Ordinary Shares held by the Founder, 50,727,273 Pre-IPO Class B ordinary shares held by the Founder pursuant to the restricted share arrangement is included in liability award.

Share-Based Compensation

12 Months Ended

Dec. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-Based Compensation

16.	SHARE-BASED COMPENSATION

Compensation expense recognized for share-based awards was as follows:

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Share-based compensation expenses
—Restricted shares owned by the Founder – equity component^(a)		2,670		826		—
—Restricted shares owned by the Founder – liability component^(a)		286		212		—
—Restricted shares owned by the Founder on behalf of certain key management founders^(a)		48		14		—
—Share options^(b)		2,817		25,391		43,168
—Shares awarded to Mr. Chen^(c)		—		90,168		—
Total share-based compensation expenses		5,821		116,611		43,168

16.	SHARE-BASED COMPENSATION (Continued)

(a)	Restricted Shares

As described in note 1 (a), the Founder and Xiaomi, made a capital contribution of RMB7,500 and RMB5,000, respectively, in exchange for 60% and 40% equity interests in Foshan Viomi, respectively. Out of the RMB7,500 invested by the Founder, RMB2,500 was invested by certain key management founders and held by the Founder on their behalf. For the equity interests held by the Founder for himself, these were ordinary shares in nature but with substantive liquidation preference, while for the equity interests held by the Founder on behalf of certain key management founders, these were the most subordinated class of equity of Foshan Viomi and did not carry any preference rights.

According to the agreement among the shareholders entered into in June 2014, the interest held by the Founders shall be subject to a repurchase feature under which Xiaomi shall purchase the interest held by the Founders at the original investment amount if the Founders voluntarily terminates their employment with Foshan Viomi. The repurchase feature shall lapse at a rate of 25% each year, consequently, the interests held by the Founders are accounted for as equity-classified share-based compensation with a vesting period of 4 years.

As discussed in note 2(v), after the Reorganization, the unvested awards held by the Founder on his own behalf consisted of a share-based compensation liability measured based on the redemption value and a share option component representing the value of upside potential of the Pre-IPO Class B Ordinary Shares which is accounted for as an equity grant, while the unvested awards held by the Founder on behalf of certain key management founders continue to be equity-classified. As the share-based compensation expenses related to the equity component of the restricted shares owned by the Founder and the restricted shares held by the Founder on behalf of certain key management founders are recognized using graded vesting method, the expenses recognized in 2017 is higher than that of 2018.

A summary of the Restricted Shares activity for the years ended December 31, 2017 and 2018 is presented below:

	Number of shares
	Restricted Shares held by the Founder on behalf of certain key management founders			Restricted Shares held by the Founder on his own behalf			Total
Outstanding at January 1, 2017		16,909,092			33,818,182			50,727,274
Vested		(8,454,546	)		(16,909,091	)		(25,363,637	)
Outstanding at December 31, 2017		8,454,546			16,909,091			25,363,637
Surrender and cancellation⁽¹⁾		(5,918,182	)		—			(5,918,182	)
Vested		(2,536,364	)		(16,909,091	)		(19,445,455	)
Outstanding at December 31, 2018		—			—			—

(1)

In June 2018, the Board of Directors and the shareholders approved a transfer and surrender of shares plan, pursuant to which, Mr. Chen, who holds 33,818,182 Class A ordinary shares on behalf of certain key management founders through Viomi Limited, transferred 16,145,454 Class A ordinary shares to key management founders and surrendered the remaining 17,672,728 Class A ordinary shares to the Company. Out of the 17,672,728 Class A ordinary shares surrendered, 5,918,182 shares were unvested restricted shares. The cancellation of these 5,918,182 shares is accounted for as an acceleration of vesting of such shares and the unrecognized share-based compensation expenses related to these 5,918,182 shares have been recognized in the consolidated financial statements for the year ended December 31, 2018. The share-based compensation expenses recognized due to the acceleration of vesting is not material.

16.	SHARE-BASED COMPENSATION (Continued)

The table below shows the details of the movement of liability-classified awards with respect to unsettled 33,818,182 restricted shares granted to the Founder for the years ended December 31, 2017 and 2018:

	Liability-classified Awards (RMB)
	Restricted Shares held by the Founder on his own behalf
Balance as at January 1, 2017		4,550
Share-based compensation expenses		286
Foreign currency translation adjustment		(98	)
Outstanding at December 31, 2017		4,738
Share-based compensation expenses		212
Foreign currency translation adjustment		408
Conversion of Restricted Shares to ordinary shares upon the completion of the IPO on September 25, 2018		(5,358	)
Outstanding at December 31, 2018		—

(b)	Share options

On September 17, 2015, the Board of Directors of the Company approved the establishment of 2015 Share Incentive Plan, the purpose of which is to provide an incentive for employees contributing to the Group. The 2015 Share Incentive Plan shall be valid and effective for 10 years from the grant date. The maximum number of shares that may be issued pursuant to all awards (including incentive share options) under 2015 Share Incentive Plan shall be 12,727,272 shares.

In June 2018, the Board of Directors and shareholders of the Company approved the 2018 Share Incentive Plan. As of December 31, 2019, the maximum of shares that may be issued under the 2018 Share Incentive Plan was 19,750,728.

For the year ended December 31, 2017, the Company granted 2,700,000 share options to employees pursuant to the 2015 Share Incentive Plan. With respect to the share options granted, 50% of the options will be vested after 24 months of the grant date and the remaining 50% will be vested in two equal installments over the following 24 months.

For the year ended December 31, 2018, the Company granted 5,460,000 and 670,000 share options to employees pursuant to the 2015 Share Incentive Plan and 2018 Share Incentive Plan, respectively. Among which, with respect to the 5,500,000 share options granted, 40% of the options will be vested after 24 months of the grant date and the remaining 60% will be vested in three equal installments over the following 36 months. With respect to 630,000 share options granted, 50% of the options will be vested after 24 months of the grant date and the remaining 50% will be vested in two equal installments over the following 24 months. For the year ended December 31, 2019, no share options were granted to employees.

The Group calculated the estimated fair value of the options on the respective grant dates using the binomial option pricing model. Assumptions used to determine the fair value of share options granted during 2017 and 2018 are summarized in the following table:

	Year ended December 31,
	2017		2018
Risk-free interest rate	3.06%-3.89%		3.62%~3.92%
Expected volatility	47.02%-49.44%		45.51%~46.99%
Expected life of option (years)	10		10
Expected dividend yield		—		—
Fair value per ordinary share	US$0.76-US$ 1.59		US$1.61-US$3.30

16.	SHARE-BASED COMPENSATION (Continued)

(1)	Risk-free interest rate

Risk-free interest rate was estimated based on the yield to maturity of China Government Bond with a maturity period close to the contractual term of the options.

(2)	Expected life of option (years)

Expected life of option (years) represents the expected years to vest the options.

(3)	Volatility

The volatility of the underlying ordinary shares during the life of the options was estimated based on the historical stock price volatility of comparable listed companies over a period comparable to the contractual term of the options.

(4)	Dividend yield

The dividend yield was estimated by the Group based on its expected dividend policy over the contractual term of the options.

(5)	Fair value per ordinary share

In determining the grant date fair value of the Company’s ordinary shares for purposes of recording share-based compensation expenses in connection with Restricted Shares owned by the Founder, Restricted Shares owned by the Founder on behalf of certain key management founders, and share options under the 2015 Share Incentive Plan and 2018 Share Incentive Plan, the Company evaluated the use of three generally accepted valuation approaches: market, cost and income approaches to estimate the enterprise value of the Company and income approach (discounted cash flow, or DCF method) was relied on for value determination with market approach (guideline companies method, or GCM) taken as reference.

DCF method of the income approach involves applying appropriate weighted average cost of capital (“WACC”), to discount the future cash flows forecast, based on the Company’s best estimates as of the valuation date, to present value. The WACC was determined based on a consideration of the factors including risk-free rate, comparative industry risk, equity risk premium, company size and non-systematic risk factors.

GCM under the market approach was adopted as reference of the equity valuation for the company. GCM employs trading multiples method of selected public comparable companies including trailing and leading enterprise value/revenue multiples.

In deriving the equity value of each class of shares, the Company applied the option pricing method. The option pricing method treats different classes of shares as call options on the total equity value, with exercise prices based on the liquidation preference or redemption amount of the certain classes of shares. Under this method, the ordinary share has value only if the fund available for distribution to shareholders exceeds the value of liquidation preference or redemption amounts at the time of a liquidity event, assuming the enterprise has funds available to make liquidation preference or redemption. Given the nature of the different classes of shares, the modeling of different classes of capital as call options on company’s enterprise value was analyzed and the values of different classes of shares were derived accordingly.

The Company also applied a discount for lack of marketability (“DLOM”), which was quantified by the black-Scholes option pricing model. Under this option-pricing method, which assumed that the put option is struck at the average price of the stock before the privately held shares can be sold, the cost of the put option was considered as a basis to determine the DLOM.

16.	SHARE-BASED COMPENSATION (Continued)

A summary of the stock option activity under the 2015 and 2018 Share Incentive Plan for the years ended December 31, 2017, 2018 and 2019 is included in the table below.

	Number of options			Weighted average exercise price (US$)		Weighted average remaining contractual life (years)		Aggregate intrinsic value (US$)
Outstanding at January 1, 2017		5,620,000			0.12		9.22		1,854
Granted		2,700,000			0.52
Forfeited		(780,000	)		0.27
Outstanding at December 31, 2017		7,540,000			0.25		8.65		3,697
Granted		6,130,000			0.64
Forfeited		(410,000	)		0.43
Outstanding at December 31, 2018		13,260,000			0.43		8.40		18,705
Forfeited		(400,000	)		0.96
Exercised		(1,494,732	)		0.17
Outstanding at December 31, 2019		11,365,268			0.44		7.59		17,737
Exercisable as of December 31, 2019		4,342,768			0.18		6.46		1,991
Expected to vest as of December 31, 2019		6,674,875			0.60		8.28		14,960

The weighted average grant date fair value of options granted for the years ended December 31, 2017 and 2018 was RMB6.01 (US$0.90) and RMB18.23 (US$2.66) per option, respectively.

As of December 31, 2019, there was RMB47,024 of unrecognized compensation expenses related to the options.

(c)	Shares awarded to Mr. Chen

On August 23, 2018, the Company issued 4,000,000 Class A ordinary shares at par value to Mr. Chen’s wholly-owned entity Viomi Limited to award his contribution to the Company’s development. Such shares were immediately vested. The issuance of such shares is accounted for as a share-based compensation to Mr. Chen. The issuance date fair value was approximately US$3.30 per share.

Net Income Per Share

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

NET INCOME PER SHARE

17.	NET INCOME PER SHARE

Basic net income per share is the amount of net income available to each share of ordinary shares outstanding during the reporting period. Diluted net income per share is the amount of net income available to each share of ordinary shares outstanding during the reporting period adjusted to include the effect of potentially dilutive ordinary shares.

For the years ended December 31, 2017 and 2018, the Group has determined that its convertible redeemable Pre-IPO Class B Ordinary Shares, convertible redeemable Series A Preferred Shares and unvested Class A ordinary shares are participating securities as they participate in undistributed earnings on an as-if-converted basis. The holders of the Pre-IPO Class B Ordinary Shares, Series A Preferred Shares and unvested Class A ordinary shares are entitled to receive dividends on a pro rata basis, as if their shares had been converted into ordinary shares. Accordingly, the Group uses the two-class method of computing net income per share, for ordinary shares and preferred shares according to the participation rights in undistributed earnings.

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Numerator:
Numerator for basic calculation - Net income attributable to ordinary shareholders of the Company		8,033		50,544		292,170

Denominator:
Denominator for basic calculation - weighted average ordinary shares outstanding		20,684,681		71,771,033		208,156,507
Dilutive effect of share options		4,895,125		7,819,747		7,699,070
Denominator for diluted calculation		25,579,806		79,590,780		215,855,577

Basic net income per ordinary share		0.39		0.70		1.40
Diluted net income per ordinary share		0.31		0.64		1.35

For the years ended December 31, 2017, 2018 and 2019, the following shares outstanding were excluded from the calculation of diluted net income per ordinary share, as their inclusion would have been anti-dilutive for the periods prescribed.

	Year ended December 31,
	2017		2018		2019
Shares issuable upon conversion of Restricted Shared owned the Founder		67,636,364		—		—
Shares issuable upon conversion of Pre-IPO Class B Ordinary Shares owned by Red Better and Shunwei		67,636,364		—		—
Shares issuable upon conversion of Series A Preferred shares		18,181,818		—		—
Shares issuable upon exercise of unvested Restricted Shares owned by the Founder on behalf of certain key management founders		13,079,391		—		—

Related Party Transactions

12 Months Ended

Dec. 31, 2019

RELATED PARTY TRANSACTIONS

18.	RELATED PARTY TRANSACTIONS

Name		Relationship with the Group
Mr. Chen		Founder
Xiaomi		Shareholder of the Group
Foshan Wanwuhulian Trade Co., Ltd. (“Foshan Wanwuhulian”)		Controlled by the Founder

The Group’s relationship with Xiaomi

Xiaomi is The Group’s strategic partner and shareholder.

The Group’s sales to Xiaomi is governed by a business cooperation agreement, pursuant to which Xiaomi is responsible for the distribution and sales of such products through their network and sales channels.

The Group also sells products through Xiaomi’s online e-commerce channel Youpin.mi.com, and is charged of commissions pursuant to a commission sales agreement.

Transaction with Xiaomi

Business cooperation agreement

The current business corporation agreement entered into in 2019 with Xiaomi governs all the Group’s sales to Xiaomi. It will expire in November 2020, and will automatically extend for successive one-year period unless objected by a party at least 30 days prior to the expiration of the then current term.

Under the business cooperation agreement, (i) certain products sold to Xiaomi are exclusively designed for and can only be sold to Xiaomi, (ii) Xiaomi shall purchase these products at a price that covers all of the Group’s costs of raw materials, outsourcing manufacture, models, logistics and paid intellectual property licensing fees, in connection with the manufacture and delivery of these products, and (iii) Xiaomi and the Group shall share gross profits, derived from sales of these products, the retail prices of which were set by Xiaomi and the Group together.

In 2019, the Group has entered into cooperation arrangement with Xiaomi for a certain type of products under which the Group acts as the agent of Xiaomi. The Group charges Xiaomi with reference to market price.

Youpin commission sales agreement

The Group has entered into a commission sales agreement with Xiaomi for the sale of the Group’s own branded products on a E-platform operated by Xiaomi, namely Youpin. The commission sales agreement will expire on December 31, 2019 and has been renewed up to December 31, 2020. Furthermore, this agreement may be terminated by Xiaomi with 30 days’ written notice.

Under the commission sales agreement, the Group shall pay a service fee, calculated as approximately 11% of the sales price excluding customers’ refunds or as otherwise agreed by the parties with respect to specific product lines, as well as a deposit to Xiaomi. The retail prices of the Group’s products on Youpin’s platform shall be no higher than the sales price from any other e-commerce merchants or the Group’s official offline sales channel, including in the event of sales or promotion.

18.	RELATED PARTY TRANSACTIONS (Continued)

(1)	Amount due from/to related parties

	As of December 31,
	2018		2019
	RMB		RMB
Accounts receivable from a related party:
Xiaomi^(a)		260,984		707,947

Other receivables from related parties:
Sales receivable from Xiaomi^(b⁾		112,320		23,908
Other receivables from Xiaomi		—		36
Total		112,320		23,944

Amounts due to related parties:
Advertising and promotion expenses payable to Xiaomi⁽^c⁾		1,887		12,919
Purchase payable to Xiaomi^(a)		3,876		12,187
Total		5,763		25,106

(2)	Purchase from related parties

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Xiaomi^(a)		1,685		18,235		43,037
Foshan Wanwuhulian^(d⁾		—		—		15,422
Total		1,685		18,235		58,459

(3)	Revenue from a related party

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Xiaomi^(a)		739,464		1,311,852		2,112,170

(4)	Selling and marketing expenses

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Commission expenses charged by Xiaomi^(b⁾		3,327		20,824		58,874
Advertising and promotion expenses charged by Xiaomi^(c⁾		—		3,774		22,977
Total		3,327		24,598		81,851

(5)	Interest expenses

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Xiaomi^(e⁾		1,761		440		—

18.	RELATED PARTY TRANSACTIONS (Continued)

(6)	Interest income

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Xiaomi^(f⁾		490		107		—

(a)

Foshan Viomi both sells water purifier and other products to and purchase Xiaomi branded products and certain raw materials from Xiaomi. The amount due from Xiaomi represents receivable arising from sales of water purifier and other products. The balance due to Xiaomi represents payable arising from purchase of Xiaomi branded products and certain raw materials.

(b)

Foshan Viomi sells its own brand products on the E-platform of Xiaomi, which charges Foshan Viomi commission and technical service fees. The amount due from Xiaomi represents sales receivable net of commission.

(c)

Foshan Viomi sells its own brand products on the E-platform of Xiaomi, which provides advertising and promotion service. The amount due to Xiaomi represents payable arising from advertising and promotion service.

(d)

Foshan Viomi purchases products from Foshan Wanwuhulian for trading during the year ended December 31, 2019.

(e)

Interest expense represents the expense of a loan provided by Xiaomi. The loan is RMB31,900 with an interest rate of 5.52% per annum. The loan term is 3 months and will be automatically extended by another 3 months if the two parties do not raise any objections on the maturity date. The loan has been settled in 2018.

(f)

Interest income represents interest from a loan provided to Xiaomi. The loan is US$5,000 with an interest rate of 3 month Libor add 10bps. The loan term is 3 months and will be automatically extended by another 3 months if the two parties do not raise any objections on the maturity date. The loan has been settled in 2018.

Fair Value Measurements

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

19.	FAIR VALUE MEASUREMENTS

Fair value reflects the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at fair value, the Group considers the principal or most advantageous market in which it would transact and considers assumptions that market participants would use when pricing the assets or liabilities.

The Group applies a fair value hierarchy that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. This guidance specifies a hierarchy of valuation techniques, which is based on whether the inputs into the valuation technique are observable or unobservable. The hierarchy is as follows:

Level 1—Valuation techniques in which all significant inputs are unadjusted quoted prices from active markets for assets or liabilities that are identical to the assets or liabilities being measured.

Level 2—Valuation techniques in which significant inputs include quoted prices from active markets for assets or liabilities that are similar to the assets or liabilities being measured and/or quoted prices for assets or liabilities that are identical or similar to the assets or liabilities being measured from markets that are not active. Also, model-derived valuations in which all significant inputs and significant value drivers are observable in active markets are Level 2 valuation techniques.

Level 3—Valuation techniques in which one or more significant inputs or significant value drivers are unobservable. Unobservable inputs are valuation technique inputs that reflect the Group’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.

19.	FAIR VALUE MEASUREMENTS (Continued)

The fair value guidance describes three main approaches to measure the fair value of assets and liabilities: (1) market approach; (2) income approach and (3) cost approach. The market approach uses prices and other relevant information generated from market transactions involving identical or comparable assets or liabilities. The income approach uses valuation techniques to convert future amounts to a single present value amount. The measurement is based on the value indicated by current market expectations about those future amounts. The cost approach is based on the amount that would currently be required to replace an asset.

When available, the Group uses quoted market prices to determine the fair value of an asset or liability. If quoted market prices are not available, the Group will measure fair value using valuation techniques that use, when possible, current market-based or independently sourced market parameters, such as interest rates and currency rates.

The Group did not have any other financial instruments that were required to be measured at fair value on a recurring basis as of December 31, 2018 and 2019 except for short-term investments (Note 7).

The following table summarizes the Group’s assets that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy as of December 31, 2018 and 2019:

	Level 1		Level 2		Level 3		Total
As of December 31, 2019
Short-term investments (i)		—		316,201		—		316,201
As of December 31, 2018
Short-term investments (i)		—		168,993		—		168,993

(i) Short-term investments represent structured deposits and the Company values these short-term investments based on quoted prices of similar products provided by banks at the end of each period, and accordingly, the Company classifies the valuation techniques that use these inputs as Level 2.

Apart from the short-term investments, the Company’s other financial instruments consist principally of cash and cash equivalents, restricted cash, short-term deposits, accounts and notes receivable, other receivables, amounts due to/from related parties, accounts and notes payable and certain accrued expenses. They are recorded at cost which approximates fair value.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Leases

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

LEASES

20.

LEASES

Our operating leases are principally for office space, facilities and self-run offline stores. At December 31, 2019, our operating leases had a weighted average discount rate of 4.75% and a weighted-average remaining lease term of 2.4 years.

The components of our lease expense were as follows:

	Year ended December 31, 2019
Lease cost
Operating lease expense		7,434
Short-term lease expense (i)		798
Total lease cost		8,232

(i) Includes leases with a term of one year or less.

Supplemental cash flow information for our leases was as follows:

Year ended

December 31,

2019

Operating cash flows relating to operating leases

7,553

Lease liabilities arising from obtaining right-of-use assets

17,427

20.	LEASES (Continued)

At December 31, 2019, the aggregate future minimum rental payments under non-cancelable agreement were as follows:

	Rental RMB
2020		7,189
2021		5,985
2022		5,519
2023		3,511
Total future minimum rental payment		22,204
Less amount representing imputed interest		(1,820	)
Present value of future minimum rental payments		20,384
Less current portion, recorded in other current liabilities		(6,993	)
Long-term lease liabilities, recorded in other long-term liabilities		13,391

Commitments and Contingencies

12 Months Ended

Dec. 31, 2019

Commitments And Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

21.	COMMITMENTS AND CONTINGENCIES

(a)	Operating commitments

As of December 31, 2018, future minimum commitments under non-cancelable agreements were as follows:

	Rental
	RMB
2019		4,284
2020		2,947
2021		1,600
2022 and after		978
		9,809

The operating commitments as of December 31, 2018 presented above mainly consist of non-cancelable operating lease commitments.

As of December 31, 2019, future minimum commitments under non-cancelable agreements were as follows:

	Rental
	RMB
2020		1,351
2021		1,827
2022		1,876
2023 and after		681
		5,735

The operating commitments as of December 31, 2019 presented above mainly consist of the short-term lease commitments and leases that have not yet commenced but that create significant rights and obligations for the Company, which are not included in operating lease right-of–use assets and lease liabilities.

21.	COMMITMENTS AND CONTINGENCIES (Continued)

(b)	Capital and other commitment

As of December 31, 2019, the Group had no outstanding capital commitments.

(c)	Legal proceedings

From time to time, the Group is involved in claims and legal proceedings that arise in the ordinary course of business. Based on currently available information, management does not believe that the ultimate outcome of these unresolved matters, individually and in the aggregate, is likely to have a material adverse effect on the Group’s financial position, results of operations or cash flows.

However, litigation is subject to inherent uncertainties and the Group’s view of these matters may change in the future. If an unfavorable outcome were to occur, there exists the possibility of a material adverse impact on the Group’s financial position and results of operations for the periods in which the unfavorable outcome occurs.

Subsequent Events

12 Months Ended

Dec. 31, 2019

Subsequent Events [Abstract]

SUBSEQUENT EVENTS

22.	SUBSEQUENT EVENTS

The recent COVID-19 outbreak has created unique global and industry-wide challenges, including challenges to the Company’s business, impacting supply chains, logistics, sales channels, as well as overall consumer sentiment and purchasing behavior. In early-2020, the COVID-19 outbreak resulted in the temporary closure of many corporate offices, retail stores, and manufacturing facilities across China. Given the strict quarantine measures put in place during this period, normal economic activity throughout China was sharply curtailed and opportunities for discretionary consumption, especially in offline sales channels, were extremely limited during the period. Our contract manufacturers’ operations were disrupted during this period, which in turn adversely affected our business and results of operations. Many of the quarantine measures within China have since been relaxed as of the date of the issuance of the consolidated financial statements, and the Company, together with its suppliers and customers, have gradually resumed normal operations in mid-February 2020. Although the Company has seen noticeable improvements in late-March and early-April, both from a supply and demand perspective, the impact of COVID-19 is expected to have a negative impact on the Company’s near-term financial results for the first quarter of 2020, including but not limited to revenue growth and reduced profit margins, as a result of the ongoing challenging industry conditions, supply chain bottlenecks and operational disruptions. In addition, the longer-term trajectory of COVID-19, both in terms scope and intensity of the outbreak, in China as well as globally, together with its impact on the industry and the broader economy and the Company's future results of operations, cash flows or financial conditions for the remainder of fiscal year 2020 are still difficult to assess or predict at this time and face significant uncertainties that will be difficult to quantify.

Restricted Net Assets

12 Months Ended

Dec. 31, 2019

Receivables [Abstract]

Restricted Net Assets

23.	RESTRICTED NET ASSETS

Relevant PRC laws and regulations permit payments of dividends by the Group’s entities incorporated in the PRC only out of their retained earnings, if any, as determined in accordance with PRC accounting standards and regulations. In addition, the Company’s entities in the PRC are required to annually appropriate 10% of their net after-tax income to the statutory general reserve fund prior to payment of any dividends, unless such reserve funds have reached 50% of their respective registered capital. As a result of these and other restrictions under PRC laws and regulations, the Company’s entities incorporated in the PRC are restricted in their ability to transfer a portion of their net assets to the Company either in the form of dividends, loans or advances, which restricted portion as calculated under U.S. GAAP amounted to RMB13,750 and RMB31,395 as of December 31, 2018 and 2019. Even though the Company currently does not require any such dividends, loans or advances from the PRC entities for working capital and other funding purposes, the Company may in the future require additional cash resources from them due to changes in business conditions, to fund future acquisitions and development, or merely to declare and pay dividends or distributions to its shareholders. Except for the above, there is no other restriction on use of proceeds generated by the Group’s subsidiaries and VIE to satisfy any obligations of the Company.

For the year ended December 31, 2019, the Company performed a test on the restricted net assets of subsidiaries and VIE in accordance with Securities and Exchange Commission Regulation S-X Rule 4-08 (e) (3), “General Notes to Financial Statements” and concluded that the restricted net assets do not exceed 25% of the consolidated net assets of the Company as of December 31, 2019 and the condensed financial information of the Company are not required to be presented.

Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Basis of presentation

(a)	Basis of presentation

Consolidation

(b)	Consolidation

Use of estimates

(c)	Use of estimates

Foreign currency translation

(d)	Foreign currency translation

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

Convenience Translation

(e)	Convenience Translation

Cash and cash equivalents

(f)	Cash and cash equivalents

Readily convertible to known amounts of cash throughout the maturity period;

ii)

So near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

Restricted cash

(g)	Restricted cash

Short-term deposits

(h)	Short-term deposits

Short-term investments

(i)	Short-term investments

Accounts receivable

(j)	Accounts receivable

Inventories

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

(k)	Inventories

Property, plant and equipment, net

(l)	Property, plant and equipment, net

	Estimated useful lives	Residual rate
Computers and equipment	2-10 years	0%-5%
Vehicle	4 years	5%

Intangible assets

(m)	Intangible assets

				Estimated useful lives
Software				5 years

Leases

(n)

Leases

Revenue recognition

(o)	Revenue recognition

1)	The Group conducts its business through various contractual arrangements, the following table disaggregates the Group’s revenue by type of contract for the years ended December 31, 2017, 2018 and 2019:

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Sales to Xiaomi		739,464		1,311,852		2,112,170
—Xiaomi-branded products		654,950		1,175,332		1,859,499
—Viomi-branded products		84,514		136,520		250,593
—Rendering services		—		—		2,078
Sales to third-party customers		133,755		1,249,377		2,535,343
		873,219		2,561,229		4,647,513

Sales to Xiaomi

The Group generated a substantial portion of its revenues from sales of products to Xiaomi.

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

- Sales to leading e-commerce platforms and offline experience stores

- Sales to customers directly through the online platforms operated by Xiaomi, third parties and the Group

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

2)	Sales returns and sales incentives

- Sales to leading e-commerce platforms

- 7 days unconditional sales return

Warranty

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

4)	Value added taxes

5)	Contract balances

Cost of revenues

(p)	Cost of revenues

Research and development expenses

(q)	Research and development expenses

Selling and marketing expenses

(r)	Selling and marketing expenses

General and administrative expenses

(s)	General and administrative expenses

Government subsidies

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

(t)	Government subsidies

Employee benefits

(u)	Employee benefits

PRC Contribution Plan

Share-based compensation

(v)	Share-based compensation

Upon the completion of the IPO on September 25, 2018, all the Pre-IPO Class B Ordinary Shares were converted into Class B Ordinary Shares, the liability award had been settled.

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

(v)	Share-based compensation (Continued)

Income taxes

(w)	Income taxes

Uncertain tax positions

Comprehensive income

(x)	Comprehensive income

Statutory reserves

(y)	Statutory reserves

The Company's subsidiaries and VIEs established in the PRC are required to make appropriations to certain non-distributable reserve funds.

2.	SIGNIFICANT ACCOUNTING POLICIES (Continued)

(y)	Statutory reserves (Continued)

Income per share

(z)	Income per share

Related parties

(aa)	Related parties

Segment reporting

(bb)	Segment reporting

Recently issued accounting pronouncements

(cc)	Recently issued accounting pronouncements

Organization and Principal Activities (Tables)

12 Months Ended

Dec. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Schedule of Principal Subsidiaries and VIEs

As of December 31, 2019, details of the Company’s principal subsidiaries and VIEs were as follows:

	Place of incorporation	Date of incorporation	Percentage of beneficial ownership	Principal activities
Subsidiaries:
Viomi HK	Hong Kong	January 30, 2015	100%	Investment holding
Lequan	PRC	May 15, 2015	100%	Investment holding
Yunmi Hulian Technology (Guangdong) Co., Ltd.	PRC	December 9, 2019	100%	Investment holding
VIEs:
Foshan Viomi	PRC	May 6, 2014	100%	Home appliance development and sales
Beijing Viomi	PRC	January 12, 2015	100%	No substantial business
Subsidiaries of Foshan Viomi:
Guangdong Lizi Technology Co., Ltd. (“Guangdong Lizi”)	PRC	July 26, 2018	VIE’s subsidiary	Home appliance development and sales
Guangdong AI Touch Technology Co., Ltd. (“AI Touch”)	PRC	January 30, 2019	VIE’s subsidiary	Home appliance development and sales

Schedule of Financial Statement Amounts and Balances of VIEs

	As of December 31,
	2018		2019
	RMB		RMB
Cash and cash equivalents		401,424		802,580
Restricted cash		29,550		30,567
Short-term deposits		—		60,000
Short-term investments		168,993		141,189
Accounts receivable from third parties (net of allowance of nil and RMB2,006 as of December 31, 2018 and 2019, respectively)		111,718		316,189
Accounts receivable from a related party (net of allowance of nil and nil as of December 31, 2018 and 2019, respectively)		260,984		707,947
Other receivable from related parties (net of allowance of nil and nil as of December 31, 2018 and 2019, respectively)		112,320		23,944
Inventories		231,975		418,015
Prepaid expenses and other current assets		46,499		61,031
Total current assets		1,363,463		2,561,462
Property, plant and equipment, net		11,301		67,293
Deferred tax assets		5,234		12,276
Intangible assets, net		169		4,357
Prepaid expenses and other non-current assets		3,636		11,170
Right-of-use assets, net		—		19,593
Total non-current assets		20,340		114,689
Total assets		1,383,803		2,676,151
Accounts and notes payable		548,481		1,043,159
Advances from customers		86,312		103,150
Amounts due to related parties		5,763		25,106
Accrued expenses and other liabilities		179,712		308,228
Short-term borrowing		—		95,868
Income tax payables		10,199		33,522
Lease liabilities due within one year		—		6,802
Total current liabilities		830,467		1,615,835
Accrued expenses and other liabilities		518		1,795
Lease liabilities		—		13,391
Total non-current liabilities		518		15,186
Total liabilities		830,985		1,631,021

	Year ended December 31,
	2017			2018			2019
	RMB			RMB			RMB
Revenue		873,083			2,561,229			4,647,513
Net income		92,159			70,232			285,221

Net cash provided by operating activities		123,182			209,690			240,823
Net cash used in investing activities		(1,234	)		(183,262	)		(97,702	)
Net cash (used in) provided by financing activities		—			(37,731	)		95,933

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Schedule of Property Plant and Equipment Estimated Useful Lives and Residual Rate

	Estimated useful lives	Residual rate
Computers and equipment	2-10 years	0%-5%
Vehicle	4 years	5%

Schedule of Amortization of Finite-Lived Intangible Assets Estimated Useful Lives

Amortization of finite-lived intangible assets is computed using the straight-line method over their estimated useful lives, which are as follows:

				Estimated useful lives
Software				5 years

Schedule of Disaggregation of Revenue by Type of Contract

the following table disaggregates the Group’s revenue by type of contract for the years ended December 31, 2017, 2018 and 2019:

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Sales to Xiaomi		739,464		1,311,852		2,112,170
—Xiaomi-branded products		654,950		1,175,332		1,859,499
—Viomi-branded products		84,514		136,520		250,593
—Rendering services		—		—		2,078
Sales to third-party customers		133,755		1,249,377		2,535,343
		873,219		2,561,229		4,647,513

Concentration and Risks (Tables)

12 Months Ended

Dec. 31, 2019

Credit Risk

Concentration Risk [Line Items]

Summary of Concentration of Risk

Accounts and notes receivable from third parties concentration of credit risk as below:

	As of December 31,
	2018				2019
	RMB				RMB
Company A		58,766	53	%		174,620	55	%
Company B		36,734	33	%		109,585	35	%

Accounts receivable from a related party concentration of credit risk as below:

	As of December 31,
	2018			2019
	RMB			RMB
Xiaomi		260,984	100%		707,947	100%

Other receivables from related parties concentration of credit risk as below:

	As of December 31,
	2018				2019
	RMB				RMB
Xiaomi		112,320	100	%		23,944	100	%

Revenue Concentration Risk

Concentration Risk [Line Items]

Summary of Concentration of Risk

	Year ended December 31,
	2017				2018				2019
	RMB				RMB				RMB
Xiaomi		739,464	85	%		1,311,852	51	%		2,112,170	45	%

Cash and Cash Equivalents (Tables)

12 Months Ended

Dec. 31, 2019

Cash And Cash Equivalents [Abstract]

Summary of Cash and Cash Equivalents Balance

	As of December 31, 2018				As of December 31, 2019
			RMB				RMB
	Amount		equivalent		Amount		equivalent
RMB		332,702		332,702		569,772		569,772
US$		88,529		607,596		57,720		402,666
Total				940,298				972,438

Short-Term Investments (Tables)

12 Months Ended

Dec. 31, 2019

Schedule Of Investments [Abstract]

Schedule of Short-Term Investments Balance

	As of December 31, 2018				As of December 31, 2019
			RMB				RMB
	Amount		equivalent		Amount		equivalent
US$		10,049		68,971		25,087		175,012
RMB		100,022		100,022		141,189		141,189
Total				168,993				316,201

Inventories (Tables)

12 Months Ended

Dec. 31, 2019

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories consisted of the followings:

	As of December 31,
	2018		2019
	RMB		RMB
Finished goods		136,494		232,671
Raw materials		95,481		185,344
Inventories		231,975		418,015

Prepaid Expenses and Other Assets (Tables)

12 Months Ended

Dec. 31, 2019

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Schedule of Prepaid Expenses and Other Assets

	As of December 31,
	2018			2019
	RMB			RMB
Advances to suppliers		23,549			43,175
Expected return assets		687			11,212
Other receivables		15,361			7,725
Lease hold improvement		206			6,825
Prepayment for equipment		3,430			4,345
Other current assets		7,293			202
Total		50,526			73,484
Less: non-current portion		(3,636	)		(11,170	)
Prepaid expenses and other assets-current portion		46,890			62,314

Property, Plant and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2019

Property Plant And Equipment [Abstract]

Schedule of Property, Plant and Equipment, Net

Property, plant and equipment, net consisted of the following:

	As of December 31,
	2018			2019
	RMB			RMB
Computers and equipment		16,270		87,374
Vehicle		508		508
Total		16,778		87,882
Less: accumulated depreciation		(5,477	)	(20,589)
Property, plant and equipment, net		11,301		67,293

Accrued Expenses and Other Liabilities (Tables)

12 Months Ended

Dec. 31, 2019

Payables And Accruals [Abstract]

Schedule of Accrued Expenses and Other Liabilities

	As of December 31,
	2018			2019
	RMB			RMB
Accrued payroll and welfare		39,700			69,269
Freight payable		50,680			63,084
Other tax payable		42,076			45,217
Product warranty		12,744			22,463
Installation fee payables		8,133			21,850
Marketing and promotion expenses		10,710			19,223
Refund liabilities		981			18,088
Professional fee payables		10,340			10,699
Deferred revenue		1,276			7,790
Other current liabilities		24,808			49,154
Total		201,448			326,837
Less: non-current portion		(518	)		(1,795	)
Accrued expenses and other liabilities-current portion		200,930			325,042

Schedule of Product Warranty Activities

Product warranty activities were as follows:

	Product Warranty
	RMB
Balance at December 31, 2017		13,909
Provided during the year		19,775
Utilized during the year		(20,940	)
Balance at December 31, 2018		12,744
Provided during the year		52,275
Utilized during the year		(42,556	)
Balance at December 31, 2019		22,463

Revenue (Tables)

12 Months Ended

Dec. 31, 2019

Revenue From Contract With Customer [Abstract]

Schedule of Revenue

	Year ended December 31
	2017		2018		2019
	RMB		RMB		RMB
Sales of product
- IoT-enabled smart home products		712,317		2,081,273		3,587,355
- Consumable products		87,500		141,940		265,844
- Other products		72,686		323,381		741,290
Total of sales of product		872,503		2,546,594		4,594,489
Rendering of services		716		14,635		53,024
Total		873,219		2,561,229		4,647,513

Income Tax Expenses (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Current and Deferred Components of Income Taxes

The current and deferred components of income taxes appearing in the consolidated statements of comprehensive income are as follows:

	Year ended December 31,
	2017			2018			2019
	RMB			RMB			RMB
Current tax expenses		15,519			26,247			52,232
Deferred tax benefit		(801	)		(2,186	)		(7,042	)
Income tax expenses	14,718			24,061			45,190

Reconciliation between Income Tax Expenses Computed by Applying PRC Enterprise Tax Rate Before Income Taxes and Actual Provision

Reconciliation between the income tax expenses computed by applying the PRC enterprise tax rate to income before income taxes and actual provision were as follows:

	Year ended December 31,
	2017			2018			2019
	RMB			RMB			RMB
Income from operations in the PRC		106,868			93,910			321,090
Income (loss) from overseas entities		1,090			(4,499	)		17,930
Income before income tax		107,958			89,411			339,020

Tax expense at PRC enterprise income tax rate of 25%		26,990			22,353			84,755
Income tax on tax holiday⁽¹⁾		(10,989	)		(9,632	)		(31,493	)
Tax effect of permanence differences⁽²⁾		(2,640	)		(7,871	)		(12,147	)
Change in valuation allowance⁽³⁾		760			602			1,592
Effect of share-based compensation		873			17,492			6,475
Effect of income tax in jurisdictions other than the PRC		(276	)		1,117			(3,992	)
Income tax expenses		14,718			24,061			45,190

(1)

(2)

The permanent book-tax differences mainly consisted of R&D super deductions.

(3)

Per Share Effect of Tax Holidays

The per share effect of the tax holidays are as follows:

	Year ended December 31,
	2017	2018		2019
	RMB	RMB		RMB
Net income per share effect – basic	0.53	0.22		0.13
Net income per share effect – diluted	0.41		0.20	0.13

Significant Components of Deferred Tax Assets

The significant components of the Group’s deferred tax assets were as follows:

	As of December 31,
	2018			2019
	RMB			RMB
Accrued expenses and others		4,616			9,245
Net operating loss carry forwards		1,560			3,511
Inventory write downs		421			1,497
Deferred income		191			1,169
Total deferred tax assets		6,788			15,422
Less: valuation allowance		(1,554	)		(3,146	)
Deferred tax assets, net		5,234			12,276

Movement of Valuation Allowance

Movement of valuation allowance

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Balance at beginning of the year		192		952		1,554
Provided		760		602		1,592
Balance at end of the year		952		1,554		3,146

Redeemable Convertible Preferred and Pre-IPO Class B Ordinary Shares (Tables)

12 Months Ended

Dec. 31, 2019

Temporary Equity Disclosure [Abstract]

Summary of Change Balance of Series A Preferred Shares and Pre-IPO Class B Ordinary Shares

The change in the balance of Series A Preferred Shares and Pre-IPO Class B Ordinary Shares included in mezzanine equity for the years ended December 31, 2017 and 2018 are as follows:

	Series A Preferred Shares			Pre-IPO Class B Ordinary Shares held by the Founder⁽¹⁾⁽²⁾			Pre-IPO Class B Ordinary Shares- owned by Xiaomi⁽¹⁾			Total
	RMB			RMB			RMB			RMB
Balance as of January 1, 2017		151,279			54,545			218,175			423,999
Accretion of preferred shares		8,834			—			—			8,834
Foreign exchange		(9,068	)		(3,169	)		(12,668	)		(24,905	)
Balance as of December 31, 2017		151,045			51,376			205,507			407,928
Accretion of preferred shares		6,563			—			—			6,563
Foreign exchange		7,487			2,437			9,743			19,667
Conversion of Series A Preferred Shares and Pre- IPO Class B Ordinary Shares to ordinary shares upon the completion of the IPO on September 25, 2018		(165,095	)		(53,813	)		(215,250	)		(434,158	)
Balance as of December 31, 2018		—			—			—			—

(1)

(2)

Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Compensation Expense Recognized for Share-Based Awards

Compensation expense recognized for share-based awards was as follows:

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Share-based compensation expenses
—Restricted shares owned by the Founder – equity component^(a)		2,670		826		—
—Restricted shares owned by the Founder – liability component^(a)		286		212		—
—Restricted shares owned by the Founder on behalf of certain key management founders^(a)		48		14		—
—Share options^(b)		2,817		25,391		43,168
—Shares awarded to Mr. Chen^(c)		—		90,168		—
Total share-based compensation expenses		5,821		116,611		43,168

Summary of Restricted Shares Activity

A summary of the Restricted Shares activity for the years ended December 31, 2017 and 2018 is presented below:

	Number of shares
	Restricted Shares held by the Founder on behalf of certain key management founders			Restricted Shares held by the Founder on his own behalf			Total
Outstanding at January 1, 2017		16,909,092			33,818,182			50,727,274
Vested		(8,454,546	)		(16,909,091	)		(25,363,637	)
Outstanding at December 31, 2017		8,454,546			16,909,091			25,363,637
Surrender and cancellation⁽¹⁾		(5,918,182	)		—			(5,918,182	)
Vested		(2,536,364	)		(16,909,091	)		(19,445,455	)
Outstanding at December 31, 2018		—			—			—

(1)

Schedule of Movement of Liability Awards with Respect to Unsettled Restricted Shares Granted

16.	SHARE-BASED COMPENSATION (Continued)

	Liability-classified Awards (RMB)
	Restricted Shares held by the Founder on his own behalf
Balance as at January 1, 2017		4,550
Share-based compensation expenses		286
Foreign currency translation adjustment		(98	)
Outstanding at December 31, 2017		4,738
Share-based compensation expenses		212
Foreign currency translation adjustment		408
Conversion of Restricted Shares to ordinary shares upon the completion of the IPO on September 25, 2018		(5,358	)
Outstanding at December 31, 2018		—

Assumptions used to Determine Fair Value of Share Options Granted

Assumptions used to determine the fair value of share options granted during 2017 and 2018 are summarized in the following table:

	Year ended December 31,
	2017		2018
Risk-free interest rate	3.06%-3.89%		3.62%~3.92%
Expected volatility	47.02%-49.44%		45.51%~46.99%
Expected life of option (years)	10		10
Expected dividend yield		—		—
Fair value per ordinary share	US$0.76-US$ 1.59		US$1.61-US$3.30

Summary of Stock Option Activity

16.	SHARE-BASED COMPENSATION (Continued)

A summary of the stock option activity under the 2015 and 2018 Share Incentive Plan for the years ended December 31, 2017, 2018 and 2019 is included in the table below.

	Number of options			Weighted average exercise price (US$)		Weighted average remaining contractual life (years)		Aggregate intrinsic value (US$)
Outstanding at January 1, 2017		5,620,000			0.12		9.22		1,854
Granted		2,700,000			0.52
Forfeited		(780,000	)		0.27
Outstanding at December 31, 2017		7,540,000			0.25		8.65		3,697
Granted		6,130,000			0.64
Forfeited		(410,000	)		0.43
Outstanding at December 31, 2018		13,260,000			0.43		8.40		18,705
Forfeited		(400,000	)		0.96
Exercised		(1,494,732	)		0.17
Outstanding at December 31, 2019		11,365,268			0.44		7.59		17,737
Exercisable as of December 31, 2019		4,342,768			0.18		6.46		1,991
Expected to vest as of December 31, 2019		6,674,875			0.60		8.28		14,960

Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Schedule of Net Income Per Share, Basic and Diluted

Accordingly, the Group uses the two-class method of computing net income per share, for ordinary shares and preferred shares according to the participation rights in undistributed earnings.

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Numerator:
Numerator for basic calculation - Net income attributable to ordinary shareholders of the Company		8,033		50,544		292,170

Denominator:
Denominator for basic calculation - weighted average ordinary shares outstanding		20,684,681		71,771,033		208,156,507
Dilutive effect of share options		4,895,125		7,819,747		7,699,070
Denominator for diluted calculation		25,579,806		79,590,780		215,855,577

Basic net income per ordinary share		0.39		0.70		1.40
Diluted net income per ordinary share		0.31		0.64		1.35

Schedule of Anti-dilutive Securities Excluded from Computation of Earnings Per Share

	Year ended December 31,
	2017		2018		2019
Shares issuable upon conversion of Restricted Shared owned the Founder		67,636,364		—		—
Shares issuable upon conversion of Pre-IPO Class B Ordinary Shares owned by Red Better and Shunwei		67,636,364		—		—
Shares issuable upon conversion of Series A Preferred shares		18,181,818		—		—
Shares issuable upon exercise of unvested Restricted Shares owned by the Founder on behalf of certain key management founders		13,079,391		—		—

Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2019

Name		Relationship with the Group
Mr. Chen		Founder
Xiaomi		Shareholder of the Group
Foshan Wanwuhulian Trade Co., Ltd. (“Foshan Wanwuhulian”)		Controlled by the Founder

Schedule of Related Party Transactions

(1)	Amount due from/to related parties

	As of December 31,
	2018		2019
	RMB		RMB
Accounts receivable from a related party:
Xiaomi^(a)		260,984		707,947

Other receivables from related parties:
Sales receivable from Xiaomi^(b⁾		112,320		23,908
Other receivables from Xiaomi		—		36
Total		112,320		23,944

Amounts due to related parties:
Advertising and promotion expenses payable to Xiaomi⁽^c⁾		1,887		12,919
Purchase payable to Xiaomi^(a)		3,876		12,187
Total		5,763		25,106

(2)	Purchase from related parties

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Xiaomi^(a)		1,685		18,235		43,037
Foshan Wanwuhulian^(d⁾		—		—		15,422
Total		1,685		18,235		58,459

(3)	Revenue from a related party

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Xiaomi^(a)		739,464		1,311,852		2,112,170

(4)	Selling and marketing expenses

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Commission expenses charged by Xiaomi^(b⁾		3,327		20,824		58,874
Advertising and promotion expenses charged by Xiaomi^(c⁾		—		3,774		22,977
Total		3,327		24,598		81,851

(5)	Interest expenses

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Xiaomi^(e⁾		1,761		440		—

18.	RELATED PARTY TRANSACTIONS (Continued)

(6)	Interest income

	Year ended December 31,
	2017		2018		2019
	RMB		RMB		RMB
Xiaomi^(f⁾		490		107		—

(a)

(b)

(c)

(d)

Foshan Viomi purchases products from Foshan Wanwuhulian for trading during the year ended December 31, 2019.

(e)

(f)

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Summary of Assets Measured at Fair Value on Recurring Basis

The following table summarizes the Group’s assets that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy as of December 31, 2018 and 2019:

	Level 1		Level 2		Level 3		Total
As of December 31, 2019
Short-term investments (i)		—		316,201		—		316,201
As of December 31, 2018
Short-term investments (i)		—		168,993		—		168,993

Leases (Tables)

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Summary of Components of Lease Expense

The components of our lease expense were as follows:

	Year ended December 31, 2019
Lease cost
Operating lease expense		7,434
Short-term lease expense (i)		798
Total lease cost		8,232

(i) Includes leases with a term of one year or less.

Supplemental Cash Flow Information for Leases

Supplemental cash flow information for our leases was as follows:

Year ended

December 31,

2019

Operating cash flows relating to operating leases

7,553

Lease liabilities arising from obtaining right-of-use assets

17,427

Schedule of Aggregate Future Minimum Rental Payments under Non-cancelable Agreement

At December 31, 2019, the aggregate future minimum rental payments under non-cancelable agreement were as follows:

	Rental RMB
2020		7,189
2021		5,985
2022		5,519
2023		3,511
Total future minimum rental payment		22,204
Less amount representing imputed interest		(1,820	)
Present value of future minimum rental payments		20,384
Less current portion, recorded in other current liabilities		(6,993	)
Long-term lease liabilities, recorded in other long-term liabilities		13,391

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2019

Commitments And Contingencies Disclosure [Abstract]

Schedule of Future Minimum Commitments under Non-Cancellable Agreements

As of December 31, 2018, future minimum commitments under non-cancelable agreements were as follows:

	Rental
	RMB
2019		4,284
2020		2,947
2021		1,600
2022 and after		978
		9,809

Schedule of Future Minimum Commitments of Short-Term Lease and Leases Not yet Commenced under Non-Cancellable Agreements

As of December 31, 2019, future minimum commitments under non-cancelable agreements were as follows:

	Rental
	RMB
2020		1,351
2021		1,827
2022		1,876
2023 and after		681
		5,735

Organization and Principal Activities - Additional Information (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands			1 Months Ended	7 Months Ended	12 Months Ended
	Sep. 25, 2018 $ / shares shares	Aug. 23, 2018 USD ($) $ / shares shares	Jul. 31, 2015 CNY (¥) shares	Jul. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2019 $ / shares shares	Dec. 31, 2018 CNY (¥) shares	Dec. 31, 2018 USD ($) $ / shares shares	Sep. 24, 2018 shares	Aug. 22, 2018 $ / shares shares	Jun. 30, 2018 shares	May 31, 2014 CNY (¥)
Organization And Principal Activities [Line Items]
Place of incorporation					E9
Entity incorporation date					2015-01
Ordinary shares issued in exchange of interest, value \| ¥						¥ 633,508
Common stock, par value per share \| $ / shares		$ 0.00001							$ 0.0001
Preferred shares, par value \| $ / shares		$ 0.00001							0.0001
Stock split ratio		10
Surrender of outstanding shares after share split		0.90
Stock, conversion basis					IPO, 16,145,454 issued Class A Ordinary Shares held by certain key management founders, 33,818,182 issued Pre-IPO Class B Ordinary Shares held by Red Better, and 67,636,364 issued Pre-IPO Class B Ordinary Shares held by Mr. Chen’s wholly-owned entity Viomi Limited was automatically converted by way of re-designation and re-classification into Class B Ordinary Shares on a one-for-one basis, and the rest of the outstanding Class A Ordinary Shares, the rest of the outstanding Pre-IPO Class B Ordinary Shares, and all outstanding Series A Preferred Shares was automatically converted by way of re-designation and re-classification into Class A Ordinary Shares on a one-for-one basis.
Foshan Viomi and Beijing Viomi
Organization And Principal Activities [Line Items]
Percentage of beneficial ownership					100.00%
Class A Ordinary Shares
Organization And Principal Activities [Line Items]
Shares issued						34,200,000	34,200,000
Ordinary shares, issued		4,000,000			98,444,732		90,200,000			33,818,182
Ordinary shares, transferred										16,145,454
Ordinary shares, surrendered										17,672,728
Common stock, par value per share \| $ / shares					$ 0.00001		$ 0.00001		$ 0.0001
Ordinary shares, shares authorized					4,800,000,000		4,800,000,000		346,545,454
Class B Ordinary Shares
Organization And Principal Activities [Line Items]
Ordinary shares, issued					110,850,000		117,600,000
Common stock, par value per share \| $ / shares					$ 0.00001		$ 0.00001
Ordinary shares, shares authorized					150,000,000		150,000,000
IPO
Organization And Principal Activities [Line Items]
Shares issued	34,200,000
Ordinary shares, shares authorized		5,000,000,000
Ordinary shares, Value of shares authorized \| $		$ 50,000
Conversion ratio of Class B Ordinary Share into Class A ordinary shares		1
Stock, conversion basis					Each Class B Ordinary Share is convertible into one Class A Ordinary Share at any time by the holder thereof.
IPO \| Class A Ordinary Shares
Organization And Principal Activities [Line Items]
Common stock, par value per share \| $ / shares		$ 0.00001
Ordinary shares, shares authorized		4,800,000,000
Ordinary shares, voting rights		1
IPO \| Class B Ordinary Shares
Organization And Principal Activities [Line Items]
Common stock, par value per share \| $ / shares		$ 0.00001
Ordinary shares, shares authorized		150,000,000
Ordinary shares, voting rights		10
IPO \| American Depositary Shares
Organization And Principal Activities [Line Items]
Shares issued	11,400,000
Shares issued price per share \| $ / shares	$ 9.00
IPO \| Designated Common Stock
Organization And Principal Activities [Line Items]
Common stock, par value per share \| $ / shares		$ 0.00001
Ordinary shares, shares authorized		50,000,000
Foshan Viomi
Organization And Principal Activities [Line Items]
Change in basis of assets and liabilities \| $							$ 0
Mr. Chen
Organization And Principal Activities [Line Items]
Equity investments amount \| ¥											¥ 7,500
Initial equity interest percent											60.00%
Mr. Chen \| Class A Ordinary Shares
Organization And Principal Activities [Line Items]
Ordinary shares, issued		4,000,000
Tianjin Jinxing
Organization And Principal Activities [Line Items]
Equity investments amount \| ¥											¥ 5,000
Initial equity interest percent											40.00%
Key Management Founders
Organization And Principal Activities [Line Items]
Equity investments amount \| ¥											¥ 2,500
Key Management Founders \| Class A Ordinary Shares
Organization And Principal Activities [Line Items]
Ordinary shares, issued								16,145,454
Red Better Limited \| Class B Ordinary Shares
Organization And Principal Activities [Line Items]
Ordinary shares, issued								33,818,182
Red Better Limited \| Key Management Founders \| Class A Ordinary Shares
Organization And Principal Activities [Line Items]
Shares issued			33,818,182
Ordinary shares issued in exchange of interest, value \| ¥			¥ 2,500
Red Better Limited \| Mr. Chen \| Class B Redeemable Convertible Ordinary Shares
Organization And Principal Activities [Line Items]
Shares issued			67,636,364
Ordinary shares issued in exchange of interest, value \| ¥			¥ 5,000
Viomi Limited \| Class B Ordinary Shares
Organization And Principal Activities [Line Items]
Shares issued			67,636,364
Ordinary shares issued in exchange of interest, value \| ¥			¥ 5,000
Ordinary shares, issued								67,636,364
Investors \| Series A Preferred Shares
Organization And Principal Activities [Line Items]
Stock issued				18,181,818
Shares issued price per share \| $ / shares				$ 1.1
Stock issued for consideration including conversion of outstanding bridge loans \| $				$ 20,000
Outstanding bridge loans \| $				$ 5,250

Organization and Principal Activities - Schedule of Principal Subsidiaries and VIEs (Details)	12 Months Ended
	Dec. 31, 2019
Organization And Principal Activities [Line Items]
Place of incorporation	E9
Viomi HK \| Subsidiaries
Organization And Principal Activities [Line Items]
Place of incorporation	K3
Date of incorporation	Jan. 30, 2015
Percentage of beneficial ownership	100.00%
Principal activities	Investment holding
Lequan \| Subsidiaries
Organization And Principal Activities [Line Items]
Place of incorporation	F4
Date of incorporation	May 15, 2015
Percentage of beneficial ownership	100.00%
Principal activities	Investment holding
Yunmi Hulian Technology (Guangdong) Co., Ltd. \| Subsidiaries
Organization And Principal Activities [Line Items]
Place of incorporation	F4
Date of incorporation	Dec. 09, 2019
Percentage of beneficial ownership	100.00%
Principal activities	Investment holding
Foshan Viomi \| VIEs
Organization And Principal Activities [Line Items]
Place of incorporation	F4
Date of incorporation	May 06, 2014
Percentage of beneficial ownership	100.00%
Principal activities	Home appliance development and sales
Beijing Viomi \| VIEs
Organization And Principal Activities [Line Items]
Place of incorporation	F4
Date of incorporation	Jan. 12, 2015
Percentage of beneficial ownership	100.00%
Principal activities	No substantial business
Guangdong Lizi Technology Co Ltd Gangdong Lizi
Organization And Principal Activities [Line Items]
Place of incorporation	F4
Date of incorporation	Jul. 26, 2018
Percentage of beneficial ownership	VIE’s subsidiary
Principal activities	Home appliance development and sales
Guangdong AI Touch Technology Co Ltd AI Touch
Organization And Principal Activities [Line Items]
Place of incorporation	F4
Date of incorporation	Jan. 30, 2019
Percentage of beneficial ownership	VIE’s subsidiary
Principal activities	Home appliance development and sales

Organization and Principal Activities - Assets and Liabilities of VIEs and its Subsidiaries and Group's taken as Whole (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Variable Interest Entity [Line Items]
Cash and cash equivalents	¥ 972,438	$ 139,682	¥ 940,298	¥ 279,952
Restricted cash	30,567	4,391	29,550
Short-term deposits	60,000	8,618
Short-term investments	316,201	45,419	168,993
Accounts and notes receivable from third parties (net of allowance of nil and RMB2,006 as of December 31, 2018 and 2019, respectively)	316,189	45,418	111,718
Other receivables from related parties (net of allowance of nil and nil as of December 31, 2018 and 2019, respectively)	23,944	3,439	112,320
Inventories	418,015	60,044	231,975
Prepaid expenses and other current assets	62,314	8,951	46,890
Total current assets	2,907,615	417,653	1,902,728
Property, plant and equipment, net	67,293	9,666	11,301
Intangible assets, net	4,357	626	169
Prepaid expenses and other non-current assets	11,170	1,604	3,636
Right-of-use assets, net	19,762	2,839
Total non-current assets	114,858	16,498	20,340
Total assets	3,022,473	434,151	1,923,068
Accounts and notes payable current	1,043,159	149,840	548,481
Advances from customers	103,150	14,817	86,312
Amounts due to related parties	25,106	3,606	5,763
Short-term borrowings	95,868	13,771
Income tax payables	33,522	4,815	10,199
Lease liabilities, current	6,993	1,004
Total current liabilities	1,632,840	234,542	851,685
Accrued expenses and other liabilities non current	1,795	258	518
Lease liabilities, non current	13,391	1,923
Total non-current liabilities	15,186	2,181	518
Total liabilities	1,648,026	$ 236,723	852,203
VIEs
Variable Interest Entity [Line Items]
Cash and cash equivalents	802,580		401,424
Restricted cash	30,567		29,550
Short-term deposits	60,000
Short-term investments	141,189		168,993
Accounts and notes receivable from third parties (net of allowance of nil and RMB2,006 as of December 31, 2018 and 2019, respectively)	316,189		111,718
Accounts receivable from a related party (net of allowance of nil and nil as of December 31, 2018 and 2019, respectively)	707,947		260,984
Other receivables from related parties (net of allowance of nil and nil as of December 31, 2018 and 2019, respectively)	23,944		112,320
Inventories	418,015		231,975
Prepaid expenses and other current assets	61,031		46,499
Total current assets	2,561,462		1,363,463
Property, plant and equipment, net	67,293		11,301
Deferred tax assets	12,276		5,234
Intangible assets, net	4,357		169
Prepaid expenses and other non-current assets	11,170		3,636
Right-of-use assets, net	19,593
Total non-current assets	114,689		20,340
Total assets	2,676,151		1,383,803
Accounts and notes payable current	1,043,159		548,481
Advances from customers	103,150		86,312
Amounts due to related parties	25,106		5,763
Accrued expenses and other liabilities	308,228		179,712
Short-term borrowings	95,868
Income tax payables	33,522		10,199
Lease liabilities, current	6,802
Total current liabilities	1,615,835		830,467
Accrued expenses and other liabilities non current	1,795		518
Lease liabilities, non current	13,391
Total non-current liabilities	15,186		518
Total liabilities	¥ 1,631,021		¥ 830,985

Organization and Principal Activities - Assets and Liabilities of VIEs and its Subsidiaries and Group's taken as Whole (Parenthetical) (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Accounts receivable from third parties, allowance	¥ 2,006	¥ 0	¥ 0
VIEs
Variable Interest Entity [Line Items]
Accounts receivable from third parties, allowance	2,006
Accounts receivable from a related party, allowance
Other receivable from related parties, allowance

Organization and Principal Activities - Results of Operations and Cash Flows of VIEs and its Subsidiaries taken as Whole (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Variable Interest Entity [Line Items]
Revenue	¥ 4,647,513	$ 667,573	¥ 2,561,229	¥ 873,219
Net income	292,170	41,968	65,358	93,240
Net cash provided by operating activities	245,484	35,260	222,269	123,906
Net cash used in investing activities	(268,956)	(38,634)	(151,821)	(1,234)
Net cash (used in) provided by financing activities	48,542	$ 6,973	604,975	2,671
VIEs
Variable Interest Entity [Line Items]
Revenue	4,647,513		2,561,229	873,083
Net income	285,221		70,232	92,159
Net cash provided by operating activities	240,823		209,690	123,182
Net cash used in investing activities	(97,702)		(183,262)	¥ (1,234)
Net cash (used in) provided by financing activities	¥ 95,933		¥ (37,731)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Significant Accounting Policies - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥) Installment Segment	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2019 USD ($)	Mar. 31, 2019	Apr. 30, 2018
Significant Accounting Policies [Line Items]
Foreign currency exchange buying rate	6.9618			6.9618
Operating lease,right of use asset	¥ 19,762,000			$ 2,839
Operating lease, liability	¥ 20,384,000
Number of installment payments from customer \| Installment	2
Percentage of estimated profit margin based on consideration of specific and relevant market factors	5.00%
Expected sales return	¥ 12,037,000	¥ 846,000
Expected return asset	572,000	687,000
Refund liability	¥ 13,602,000	981,000
Value added tax rate	13.00%			13.00%	16.00%	17.00%
Accounts and notes receivable from key customers	¥ 1,026,142,000	372,702,000	¥ 253,896,000
Recognized impairments, net of recoveries, for accounts receivable from customers	2,006,000	0	0
Deferred revenue	7,790,000	1,276,000	146,000
Advertising and market promotion expenses	106,540,000	130,796,000	39,638,000
Shipping expenses	245,329,000	140,456,000	20,044,000
Subsidy income	35,988,000	1,440,000	1,278,000
Uncertain tax positions, interest and penalties recognized	0	0	0
Statutory reserve funds	¥ 1,047,000	0	6,250,000
Number of operating segment \| Segment	1
Additional Paid-in Capital
Significant Accounting Policies [Line Items]
Accumulated statutory reserve funds	¥ 7,297,000	6,250,000
P R C Contribution Plan
Significant Accounting Policies [Line Items]
Employee benefit expenses	23,465,000	18,889,000	8,016,000
Installation Services [Member]
Significant Accounting Policies [Line Items]
Deferred revenue	7,790,000
Revenue recognized amount	¥ 1,276,000	¥ 146,000	¥ 29,000
Xiaomi Inc
Significant Accounting Policies [Line Items]
Percentage of second installment payment arrangement to total revenue	5.90%	9.00%	15.00%
Accounting Standards Update 2016-02
Significant Accounting Policies [Line Items]
Operating lease,right of use asset		¥ 9,274,000
Operating lease, liability		¥ 9,168,000

Significant Accounting Policies - Schedule of Property Plant and Equipment Estimated Useful Lives and Residual Rate (Detail)	12 Months Ended
	Dec. 31, 2019
Computers and Equipment \| Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful lives	2 years
Property, plant and equipment, Residual rate	0.00%
Computers and Equipment \| Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful lives	10 years
Property, plant and equipment, Residual rate	5.00%
Vehicles
Property Plant And Equipment [Line Items]
Property, plant and equipment, Estimated useful lives	4 years
Property, plant and equipment, Residual rate	5.00%

Significant Accounting Policies - Schedule of Amortization of Finite-Lived Intangible Assets Estimated Useful Lives (Detail)	12 Months Ended
	Dec. 31, 2019
Software
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Estimated useful lives	5 years

Significant Accounting Policies - Schedule of Disaggregation of Revenue by Type of Contract (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Disaggregation Of Revenue [Line Items]
Revenue	¥ 4,647,513	$ 667,573	¥ 2,561,229	¥ 873,219
Sales to Xiaomi
Disaggregation Of Revenue [Line Items]
Revenue	2,112,170		1,311,852	739,464
Sales to Xiaomi \| Xiaomi-branded Products
Disaggregation Of Revenue [Line Items]
Revenue	1,859,499		1,175,332	654,950
Sales to Xiaomi \| Viomi-branded Products
Disaggregation Of Revenue [Line Items]
Revenue	250,593		136,520	84,514
Sales to Xiaomi \| Rendering Services
Disaggregation Of Revenue [Line Items]
Revenue	2,078
Sales to Third Party Customers
Disaggregation Of Revenue [Line Items]
Revenue	¥ 2,535,343		¥ 1,249,377	¥ 133,755

Concentration and Risks - Schedule of Accounts and Notes Receivable from Third Parties Concentration of Credit Risk (Details) - Accounts and Notes Receivable - Credit Risk - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Company A
Concentration Risk [Line Items]
Accounts and notes receivable	¥ 174,620	¥ 58,766
Concentration risk, percentage	55.00%	53.00%
Company B
Concentration Risk [Line Items]
Accounts and notes receivable	¥ 109,585	¥ 36,734
Concentration risk, percentage	35.00%	33.00%

Concentration and Risks - Schedule of Accounts Receivable from Related Party Concentration of Credit Risk (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2019 USD ($)
Concentration Risk [Line Items]
Accounts receivable	¥ 707,947	¥ 260,984	$ 101,691
Xiaomi Inc \| Accounts Receivable \| Credit Risk
Concentration Risk [Line Items]
Accounts receivable	¥ 707,947	¥ 260,984
Concentration risk, percentage	100.00%	100.00%

Concentration and Risks - Schedule of Other Receivables from Related Parties Concentration of Credit Risk (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2019 USD ($)
Concentration Risk [Line Items]
Other receivables	¥ 23,944	¥ 112,320	$ 3,439
Xiaomi Inc \| Other Receivables \| Credit Risk
Concentration Risk [Line Items]
Other receivables	¥ 23,944	¥ 112,320
Concentration risk, percentage	100.00%	100.00%

Concentration and Risks - Summary of Revenue Concentration Risk (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Concentration Risk [Line Items]
Revenue	¥ 4,647,513	$ 667,573	¥ 2,561,229	¥ 873,219
Xiaomi Inc \| Sales Revenue, Net \| Revenue Concentration Risk
Concentration Risk [Line Items]
Revenue	¥ 2,112,170		¥ 1,311,852	¥ 739,464
Concentration risk, percentage	45.00%	45.00%	51.00%	85.00%

Concentration and Risks - Additional Information (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Concentration Risk [Line Items]
Revenue	¥ 4,647,513	$ 667,573	¥ 2,561,229	¥ 873,219
Contract With Xiaomi \| Viomi-branded Products
Concentration Risk [Line Items]
Revenue	¥ 250,593		¥ 136,520	¥ 84,514

Cash and Cash Equivalents - Summary of Cash and Cash Equivalents Balance (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)
Cash And Cash Equivalents [Line Items]
Cash and cash equivalents	¥ 972,438	$ 139,682	¥ 940,298		¥ 279,952
RMB
Cash And Cash Equivalents [Line Items]
Cash and cash equivalents	569,772	569,772	332,702	$ 332,702
US$
Cash And Cash Equivalents [Line Items]
Cash and cash equivalents	¥ 402,666	$ 57,720	¥ 607,596	$ 88,529

Restricted Cash - Additional Information (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)
Cash And Cash Equivalents [Abstract]
Restricted cash	¥ 30,567	$ 4,391	¥ 29,550

Short-Term Investments - Schedule of Short-Term Investments Balance (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)
Schedule Of Investments [Line Items]
Short-term investments	¥ 316,201	$ 45,419	¥ 168,993
RMB
Schedule Of Investments [Line Items]
Short-term investments	141,189	141,189	100,022	$ 100,022
US$
Schedule Of Investments [Line Items]
Short-term investments	¥ 175,012	$ 25,087	¥ 68,971	$ 10,049

Inventories - Schedule of Inventories (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)
Inventory Disclosure [Abstract]
Finished goods	¥ 232,671		¥ 136,494
Raw materials	185,344		95,481
Inventories	¥ 418,015	$ 60,044	¥ 231,975

Inventories - Additional Information (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Inventory Disclosure [Abstract]
Inventory write-down	¥ 15,661	$ 2,250	¥ 1,059	¥ 81

Prepaid Expenses and Other Assets - Schedule of Prepaid Expenses and Other Assets (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Advances to suppliers	¥ 43,175		¥ 23,549
Expected return assets	11,212		687
Other receivables	7,725		15,361
Lease hold improvement	6,825		206
Prepayment for equipment	4,345		3,430
Other current assets	202		7,293
Total	73,484		50,526
Less: non-current portion	(11,170)	$ (1,604)	(3,636)
Prepaid expenses and other current assets	¥ 62,314	$ 8,951	¥ 46,890

Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment, Net (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	¥ 87,882		¥ 16,778
Less: accumulated depreciation	(20,589)		(5,477)
Property, plant and equipment, net	67,293	$ 9,666	11,301
Computers and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	87,374		16,270
Vehicles
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	¥ 508		¥ 508

Property, Plant and Equipment, Net - Additional Information (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Depreciation expense	¥ 15,427	¥ 2,244	¥ 1,680
Impairment charge	¥ 0	¥ 0	¥ 0

Accrued Expenses and Other Liabilities - Schedule of Accrued Expenses and Other Liabilities (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)
Payables And Accruals [Abstract]
Accrued payroll and welfare	¥ 69,269		¥ 39,700
Freight payable	63,084		50,680
Other tax payable	45,217		42,076
Product warranty	22,463		12,744
Installation fee payables	21,850		8,133
Marketing and promotion expenses	19,223		10,710
Refund liabilities	18,088		981
Professional fee payables	10,699		10,340
Deferred revenue	7,790		1,276
Other current liabilities	49,154		24,808
Total	326,837		201,448
Less: non-current portion	(1,795)		(518)
Accrued expenses and other liabilities-current portion	¥ 325,042	$ 46,689	¥ 200,930

Accrued Expenses and Other Liabilities - Schedule of Product Warranty Activities (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Payables And Accruals [Abstract]
Beginning Balance	¥ 12,744	¥ 13,909
Provided during the year	52,275	19,775
Utilized during the year	(42,556)	(20,940)
Ending Balance	¥ 22,463	¥ 12,744

Revenue - Schedule of Revenue (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Disaggregation Of Revenue [Line Items]
Revenue	¥ 4,647,513	$ 667,573	¥ 2,561,229	¥ 873,219
IoT-enabled Smart Home Products
Disaggregation Of Revenue [Line Items]
Revenue	3,587,355		2,081,273	712,317
Consumable Products
Disaggregation Of Revenue [Line Items]
Revenue	265,844		141,940	87,500
Other Products
Disaggregation Of Revenue [Line Items]
Revenue	741,290		323,381	72,686
Total of Sales of Product
Disaggregation Of Revenue [Line Items]
Revenue	4,594,489		2,546,594	872,503
Rendering of Services
Disaggregation Of Revenue [Line Items]
Revenue	¥ 53,024		¥ 14,635	¥ 716

Income Tax Expenses - Additional Information (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Hong Kong \| Taxable Income Within HKD$2 million
Income Tax Disclosure [Line Items]
Income tax rate	8.25%
Hong Kong \| Taxable Income Beyond HKD$2 million
Income Tax Disclosure [Line Items]
Income tax rate	16.50%
PRC
Income Tax Disclosure [Line Items]
Percentage of qualified research and development expenses enterprises are entitled to claim as additional tax deduction	75.00%	50.00%	50.00%
Withholding tax rate	10.00%
Undistributed earnings available for distribution	¥ 598,503		¥ 282,130
Statute of limitations year	3 years
Statute of limitations extended period	5 years
PRC \| Arrangement Between PRC and Hong Kong Special Administrative Region on Avoidance of Double Taxation and Prevention of Fiscal Evasion with Respect to Taxes on Income and Capital
Income Tax Disclosure [Line Items]
Withholding tax rate	5.00%
Minimum percentage of equity interests in PRC foreign-invested enterprise to be subject to special withholding tax rate	25.00%
Withholding income tax rate on dividends for Hong Kong holding company which is not considered to be beneficial owner	10.00%
PRC \| 2018
Income Tax Disclosure [Line Items]
Percentage of qualified research and development expenses enterprises are entitled to claim as additional tax deduction	75.00%
PRC \| 2020
Income Tax Disclosure [Line Items]
Percentage of qualified research and development expenses enterprises are entitled to claim as additional tax deduction	75.00%
PRC \| Enterprise Income Tax
Income Tax Disclosure [Line Items]
Income tax rate	25.00%
PRC \| Subsidiaries and VIEs and Predecessor Operations
Income Tax Disclosure [Line Items]
Income tax rate	25.00%	25.00%	25.00%
PRC \| High and New Technology Enterprises
Income Tax Disclosure [Line Items]
Income tax rate	15.00%

Income Tax Expenses - Current and Deferred Components of Income Taxes (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Income Tax Disclosure [Abstract]
Current tax expenses	¥ 52,232		¥ 26,247	¥ 15,519
Deferred tax benefit	(7,042)	$ (1,012)	(2,186)	(801)
Income tax expenses	¥ 45,190	$ 6,491	¥ 24,061	¥ 14,718

Income Tax Expenses - Reconciliation between Income Tax Expenses Computed by Applying PRC Enterprise Tax Rate Before Income Taxes and Actual Provision (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Income Tax Disclosure [Abstract]
Income from operations in the PRC	¥ 321,090		¥ 93,910	¥ 106,868
Income (loss) from overseas entities	17,930		(4,499)	1,090
Income before income tax expenses	339,020	$ 48,697	89,411	107,958
Tax expense at PRC enterprise income tax rate of 25%	84,755		22,353	26,990
Income tax on tax holiday	(31,493)		(9,632)	(10,989)
Tax effect of permanence differences	(12,147)		(7,871)	(2,640)
Change in valuation allowance	1,592		602	760
Effect of share-based compensation	6,475		17,492	873
Effect of income tax in jurisdictions other than the PRC	(3,992)		1,117	(276)
Income tax expenses	¥ 45,190	$ 6,491	¥ 24,061	¥ 14,718

Income Tax Expenses - Reconciliation between Income Tax Expenses Computed by Applying PRC Enterprise Tax Rate Before Income Taxes and Actual Provision (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
High and New Technology Enterprises
Income Tax Disclosure [Line Items]
Beneficial tax rate	15.00%	15.00%	15.00%

Income Tax Expenses - Per Share Effect of Tax Holidays (Details) - ¥ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net income per share effect – basic	¥ 0.13	¥ 0.22	¥ 0.53
Net income per share effect – diluted	¥ 0.13	¥ 0.20	¥ 0.41

Income Tax Expenses - Significant Components of Deferred Tax Assets (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Accrued expenses and others	¥ 9,245	¥ 4,616
Net operating loss carry forwards	3,511	1,560
Inventory write downs	1,497	421
Deferred income	1,169	191
Total deferred tax assets	15,422	6,788
Less: valuation allowance	(3,146)	(1,554)
Deferred tax assets, net	¥ 12,276	¥ 5,234

Income Tax Expenses - Movement of Valuation Allowance (Details) - Valuation Allowance of Deferred Tax Assets - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Valuation Allowance [Line Items]
Balance at beginning of the year	¥ 1,554	¥ 952	¥ 192
Provided	1,592	602	760
Balance at end of the year	¥ 3,146	¥ 1,554	¥ 952

Ordinary Shares - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	12 Months Ended
	Sep. 25, 2018	Aug. 23, 2018	Jul. 31, 2015	Dec. 31, 2019	Dec. 31, 2018	Sep. 24, 2018	Aug. 22, 2018	Jun. 30, 2018	Dec. 31, 2017
Class Of Stock [Line Items]
Common stock, par value per share		$ 0.00001					$ 0.0001
Preferred shares, par value		$ 0.00001					$ 0.0001
Number of ordinary shares		10
Surrendered percentage of ordinary shares after share split		90.00%
Stock, conversion basis				IPO, 16,145,454 issued Class A Ordinary Shares held by certain key management founders, 33,818,182 issued Pre-IPO Class B Ordinary Shares held by Red Better, and 67,636,364 issued Pre-IPO Class B Ordinary Shares held by Mr. Chen’s wholly-owned entity Viomi Limited was automatically converted by way of re-designation and re-classification into Class B Ordinary Shares on a one-for-one basis, and the rest of the outstanding Class A Ordinary Shares, the rest of the outstanding Pre-IPO Class B Ordinary Shares, and all outstanding Series A Preferred Shares was automatically converted by way of re-designation and re-classification into Class A Ordinary Shares on a one-for-one basis.
IPO
Class Of Stock [Line Items]
Common stock, shares authorized		5,000,000,000
Ordinary shares, voting rights				Each Class A Ordinary Share is entitled to one vote, and each Class B Ordinary Share is entitled to ten (10) votes, voting together as one class
Ordinary shares, Value of shares authorized		$ 50,000
Stock, conversion basis				Each Class B Ordinary Share is convertible into one Class A Ordinary Share at any time by the holder thereof.
Issuance of ordinary shares Initial Public Offering, in shares	34,200,000
Class A Ordinary Shares
Class Of Stock [Line Items]
Common stock, shares authorized				4,800,000,000	4,800,000,000		346,545,454
Common stock, par value per share				$ 0.00001	$ 0.00001		$ 0.0001
Ordinary shares, outstanding				98,444,732	90,200,000				25,363,636
Ordinary shares, voting rights				Each ordinary share is entitled to one vote
Common stock, shares issued		4,000,000		98,444,732	90,200,000			33,818,182
Ordinary shares, transferred								16,145,454
Ordinary shares, surrendered								17,672,728
Fair value per share		$ 3.30
Issuance of ordinary shares Initial Public Offering, in shares					34,200,000
Shares issued upon conversion (in shares)				6,750,000	18,181,818
Issuance of ordinary shares for exercised share options (in shares)				1,494,732
Class A Ordinary Shares \| Key Management Founders
Class Of Stock [Line Items]
Common stock, shares issued						16,145,454
Class A Ordinary Shares \| IPO
Class Of Stock [Line Items]
Common stock, shares authorized		4,800,000,000
Common stock, par value per share		$ 0.00001
Class B Ordinary Shares
Class Of Stock [Line Items]
Common stock, shares authorized				150,000,000	150,000,000
Common stock, par value per share				$ 0.00001	$ 0.00001
Ordinary shares, outstanding				110,850,000	117,600,000
Common stock, shares issued				110,850,000	117,600,000
Class B Ordinary Shares \| Red Better Limited
Class Of Stock [Line Items]
Common stock, shares issued						33,818,182
Class B Ordinary Shares \| Viomi Limited
Class Of Stock [Line Items]
Common stock, shares issued						67,636,364
Issuance of ordinary shares Initial Public Offering, in shares			67,636,364
Class B Ordinary Shares \| IPO
Class Of Stock [Line Items]
Common stock, shares authorized		150,000,000
Common stock, par value per share		$ 0.00001
Designated Common Stock \| IPO
Class Of Stock [Line Items]
Common stock, shares authorized		50,000,000
Common stock, par value per share		$ 0.00001

Redeemable Convertible Preferred and Pre-IPO Class B Ordinary Shares - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	7 Months Ended	12 Months Ended
	Jul. 31, 2015	Dec. 31, 2015
Series A Preferred Shares
Temporary Equity [Line Items]
Dividend rights rate percentage		8.00%
Liquidation rights rate percentage		150.00%
Series A Preferred Shares \| Investors
Temporary Equity [Line Items]
Stock issued	18,181,818
Temporary equity per share	$ 0.0001
Shares issued price per share	$ 1.1
Stock issued for consideration including conversion of outstanding bridge loans	$ 20,000
Outstanding bridge loans	$ 5,250
Series A Preferred Shares and Pre-IPO Class B Ordinary Shares
Temporary Equity [Line Items]
Initial conversion ratio description	1-to-1 initial conversion ratio
Compound interest return per annum on issuance price	6.00%
Class B Ordinary Shares
Temporary Equity [Line Items]
Dividend rights rate percentage		8.00%
Liquidation rights rate percentage		150.00%
Stock issued during upon exchange of equity interest		67,636,364

Redeemable Convertible Preferred and Pre-IPO Class B Ordinary Shares - Summary of Change Balance of Series A Preferred Shares and Pre-IPO Class B Ordinary Shares (Details) - CNY (¥)	9 Months Ended	12 Months Ended
	Sep. 25, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Temporary Equity [Line Items]
Beginning Balance	¥ 407,928,000		¥ 407,928,000	¥ 423,999,000
Accretion of preferred shares	6,563,000			8,834,000
Foreign exchange	19,667,000			(24,905,000)
Conversion of Series A Preferred Shares and Pre-IPO Class B Ordinary Shares to ordinary shares upon the completion of the IPO on September 25, 2018	(434,158,000)
Ending Balance				407,928,000
Series A Preferred Shares
Temporary Equity [Line Items]
Beginning Balance	151,045,000		151,045,000	151,279,000
Accretion of preferred shares	6,563,000			8,834,000
Foreign exchange	7,487,000			(9,068,000)
Conversion of Series A Preferred Shares and Pre-IPO Class B Ordinary Shares to ordinary shares upon the completion of the IPO on September 25, 2018	(165,095,000)
Ending Balance				151,045,000
Class B Ordinary Shares
Temporary Equity [Line Items]
Accretion of preferred shares		¥ 0	0	0
Founder \| Class B Ordinary Shares
Temporary Equity [Line Items]
Beginning Balance	51,376,000		51,376,000	54,545,000
Foreign exchange	2,437,000			(3,169,000)
Conversion of Series A Preferred Shares and Pre-IPO Class B Ordinary Shares to ordinary shares upon the completion of the IPO on September 25, 2018	(53,813,000)
Ending Balance				51,376,000
Xiaomi Inc \| Class B Ordinary Shares
Temporary Equity [Line Items]
Beginning Balance	205,507,000		¥ 205,507,000	218,175,000
Foreign exchange	9,743,000			(12,668,000)
Conversion of Series A Preferred Shares and Pre-IPO Class B Ordinary Shares to ordinary shares upon the completion of the IPO on September 25, 2018	¥ (215,250,000)
Ending Balance				¥ 205,507,000

Redeemable Convertible Preferred and Pre-IPO Class B Ordinary Shares - Summary of Change Balance of Series A Preferred Shares and Pre-IPO Class B Ordinary Shares (Parenthetical) (Details) - CNY (¥)	9 Months Ended	12 Months Ended
	Sep. 25, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015
Temporary Equity [Line Items]
Accretion of preferred shares	¥ 6,563,000			¥ 8,834,000
Class B Ordinary Shares
Temporary Equity [Line Items]
Accretion of preferred shares		¥ 0	¥ 0	¥ 0
Stock issued during upon exchange of equity interest					67,636,364
Class B Ordinary Shares \| Restricted Share Arrangement
Temporary Equity [Line Items]
Stock issued during upon exchange of equity interest					50,727,273

Share-Based Compensation - Schedule of Compensation Expense Recognized for Share-Based Awards (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share-based compensation expenses	¥ 43,168	¥ 116,611	¥ 5,821
Restricted Shares Owned by the Founder – Equity Component
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share-based compensation expenses		826	2,670
Restricted Shares Owned by the Founder – Liability Component
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share-based compensation expenses		212	286
Restricted Shares Owned by the Founder on Behalf of Certain Key Management Founders
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share-based compensation expenses		14	48
Share Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share-based compensation expenses	¥ 43,168	25,391	¥ 2,817
Shares Awarded to Mr. Chen
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share-based compensation expenses		¥ 90,168

Share-Based Compensation - Additional Information (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands			1 Months Ended		12 Months Ended
	Aug. 23, 2018 $ / shares shares	Sep. 17, 2015 shares	Jun. 30, 2014	May 31, 2014 CNY (¥)	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 CNY (¥) ¥ / shares shares	Dec. 31, 2018 $ / shares shares	Dec. 31, 2017 CNY (¥) ¥ / shares shares	Dec. 31, 2017 $ / shares	Dec. 31, 2019 CNY (¥) shares	Sep. 24, 2018 shares	Jun. 30, 2018 shares	Dec. 31, 2016 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Capital contribution					$ 0	¥ 2,705		¥ 2,671
Number of share options granted to employees under stock incentive plans					0
Weighted average grant date fair value of options granted \| (per share)						¥ 18.23	$ 2.66	¥ 6.01	$ 0.90
Unrecognized compensation expenses related to options \| ¥										¥ 47,024
Class A Ordinary Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Ordinary shares, issued	4,000,000					90,200,000	90,200,000			98,444,732		33,818,182
2015 Share Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share incentive plan effective period		10 years
Maximum number of shares issued under share incentive plan		12,727,272
Number of share options granted to employees under stock incentive plans						5,460,000		2,700,000
2015 Share Incentive Plan \| Vested after 24 Months
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share options vested percentage								50.00%
2015 Share Incentive Plan \| Vested in Two Equal Installments over Following 24 Months
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share options vested percentage								50.00%
2018 Share Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number of shares issued under share incentive plan										19,750,728
Number of share options granted to employees under stock incentive plans						670,000
2015 Share Incentive Plan and 2018 Share Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of share options granted to employees under stock incentive plans						6,130,000		2,700,000
2015 Share Incentive Plan and 2018 Share Incentive Plan \| Vested after 24 Months
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of share options granted to employees under stock incentive plans						5,500,000
2015 Share Incentive Plan and 2018 Share Incentive Plan \| Vested in Two Equal Installments over Following 24 Months
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of share options granted to employees under stock incentive plans						630,000
2015 Share Incentive Plan and 2018 Share Incentive Plan \| With Respect to 5,500,000 Share Options Granted, Vesting after 24 Months
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share options vested percentage						40.00%
2015 Share Incentive Plan and 2018 Share Incentive Plan \| With Respect to 5,500,000 Share Options Granted, Vested in Three Equal Installments over Following 36 Months
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share options vested percentage						60.00%
2015 Share Incentive Plan and 2018 Share Incentive Plan \| With Respect to 630,000 Share Options Granted, Vesting after 24 Months
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share options vested percentage						50.00%
2015 Share Incentive Plan and 2018 Share Incentive Plan \| With Respect to 630,000 Share Options Granted, Vested in Two Equal Installments over Following 24 Months
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share options vested percentage						50.00%
Founder
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Capital contribution \| ¥				¥ 7,500
Equity interests				60.00%
Equity investments amount \| ¥				¥ 7,500
Repurchase of shares lapse rate			0.25
Vesting period			4 years
Founder \| Class A Ordinary Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Ordinary shares, issued	4,000,000
Estimated fair value per share \| $ / shares	$ 3.30
Founder \| Restricted Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unsettled restricted shares granted													33,818,182
Tianjin Jinxing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Capital contribution \| ¥				¥ 5,000
Equity interests				40.00%
Equity investments amount \| ¥				¥ 5,000
Key Management Founders
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity investments amount \| ¥				¥ 2,500
Key Management Founders \| Class A Ordinary Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Ordinary shares, issued											16,145,454

Share-Based Compensation - Summary of Restricted Shares Activity (Details) - shares

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Restricted Shares Owned by the Founder on Behalf of Certain Key Management Founders

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Number of shares, Outstanding, Beginning Period

8,454,546

16,909,092

Number of shares, Surrender and cancellation

^[1]

(5,918,182)

Number of shares, Vested

(2,536,364)

(8,454,546)

Number of shares, Outstanding, Ending Period

8,454,546

Restricted Shares Owned By Founder On His Own Behalf

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Number of shares, Outstanding, Beginning Period

16,909,091

33,818,182

Number of shares, Vested

(16,909,091)

Number of shares, Outstanding, Ending Period

16,909,091

Restricted Shares

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Number of shares, Outstanding, Beginning Period

25,363,637

50,727,274

Number of shares, Surrender and cancellation

^[1]

(5,918,182)

Number of shares, Vested

(19,445,455)

(25,363,637)

Number of shares, Outstanding, Ending Period

25,363,637

[1]

Share-Based Compensation - Summary of Restricted Shares Activity (Parenthetical) (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Aug. 23, 2018	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested restricted shares					25,363,637	50,727,274
Class A Ordinary Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Ordinary shares, issued	90,200,000	98,444,732	4,000,000	33,818,182
Ordinary shares, surrendered				17,672,728
Class A Ordinary Shares \| Restricted Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Ordinary shares, surrendered				17,672,728
Unvested restricted shares				5,918,182
Acceleration of vesting shares	5,918,182
Mr. Chen \| Class A Ordinary Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Ordinary shares, issued			4,000,000
Mr. Chen \| Class A Ordinary Shares \| Restricted Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Ordinary shares, held				33,818,182
Key Management Founders \| Class A Ordinary Shares \| Restricted Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Ordinary shares, issued				16,145,454

Share-Based Compensation - Schedule of Movement of Liability Awards with Respect to Unsettled Restricted Shares Granted (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expenses	¥ 43,168	¥ 116,611	¥ 5,821
Restricted Shares Owned By Founder On His Own Behalf
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Balance outstanding	¥ 0	4,738	4,550
Share-based compensation expenses		212	286
Foreign currency translation adjustment		408	(98)
Balance outstanding		0	¥ 4,738
Restricted Shares Owned By Founder On His Own Behalf \| IPO
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Conversion of Restricted Shares to ordinary shares upon the completion of the IPO on September 25, 2018		¥ (5,358)

Share-Based Compensation - Assumptions used to Determine Fair Value of Share Options Granted (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate, minimum	3.62%	3.06%
Risk-free interest rate, maximum	3.92%	3.89%
Expected volatility, minimum	45.51%	47.02%
Expected volatility, maximum	46.99%	49.44%
Expected life of option (years)	10 years	10 years
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value per ordinary share	$ 1.61	$ 0.76
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value per ordinary share	$ 3.30	$ 1.59

Share-Based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of options, Granted	0
2015 and 2018 Share Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of options, Outstanding, Beginning Period	13,260,000	7,540,000	5,620,000
Number of options, Granted		6,130,000	2,700,000
Number of options, Forfeited	(400,000)	(410,000)	(780,000)
Number of options, Exercised	(1,494,732)
Number of options, Outstanding, Ending Period	11,365,268	13,260,000	7,540,000	5,620,000
Number of options, Exercisable	4,342,768
Number of options, Expected to vest	6,674,875
Weighted average exercise price, Outstanding, Beginning Period	$ 0.43	$ 0.25	$ 0.12
Weighted average exercise price, Granted		0.64	0.52
Weighted average exercise price, Forfeited	0.96	0.43	0.27
Weighted average exercise price, Exercised	0.17
Weighted average exercise price, Outstanding, Ending Period	0.44	$ 0.43	$ 0.25	$ 0.12
Weighted average exercise price, Exercisable	0.18
Weighted average exercise price, Expected to vest	$ 0.60
Weighted-average remaining contractual life (years), Outstanding	7 years 7 months 2 days	8 years 4 months 24 days	8 years 7 months 24 days	9 years 2 months 19 days
Weighted-average remaining contractual life (years), Exercisable	6 years 5 months 15 days
Weighted-average remaining contractual life (years), Expected to vest	8 years 3 months 10 days
Aggregate intrinsic value, Outstanding	$ 17,737	$ 18,705	$ 3,697	$ 1,854
Aggregate intrinsic value, Exercisable	1,991
Aggregate intrinsic value, Expected to vest	$ 14,960

Net Income Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥) ¥ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 CNY (¥) ¥ / shares shares	Dec. 31, 2017 CNY (¥) ¥ / shares shares
Numerator:
Numerator for basic calculation - Net income attributable to ordinary shareholders of the Company	¥ 292,170	$ 41,968	¥ 50,544	¥ 8,033
Denominator:
Denominator for basic calculation - weighted average ordinary shares outstanding	208,156,507	208,156,507	71,771,033	20,684,681
Dilutive effect of share options	7,699,070	7,699,070	7,819,747	4,895,125
Denominator for diluted calculation	215,855,577	215,855,577	79,590,780	25,579,806
Basic net income per ordinary share \| (per share)	¥ 1.40	$ 0.20	¥ 0.70	¥ 0.39
Diluted net income per ordinary share \| (per share)	¥ 1.35	$ 0.19	¥ 0.64	¥ 0.31

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

Net Income Per Share - Schedule of Anti-dilutive Securities Excluded from Computation of Earnings Per Share (Details)	12 Months Ended
	Dec. 31, 2017 shares
Class B Ordinary Shares \| Red Better and Shunwei
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive outstanding shares	67,636,364
Series A Preferred Shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive outstanding shares	18,181,818
Restricted Shares \| Founder
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive outstanding shares	67,636,364
Unvested Restricted Shares \| Founder
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive outstanding shares	13,079,391

Related Party Transactions - Schedule of Related Party Transaction Relationship (Details)	12 Months Ended
	Dec. 31, 2019
Founder
Related Party Transaction [Line Items]
Relationship with the Group	Founder
Xiaomi
Related Party Transaction [Line Items]
Relationship with the Group	Shareholder of the Group
Foshan Wanwuhulian Trade Co., Limited
Related Party Transaction [Line Items]
Relationship with the Group	Controlled by the Founder

Related Party Transactions - Additional Information (Details) - Xiaomi	12 Months Ended
	Dec. 31, 2019
Business Corporation Agreement
Related Party Transaction [Line Items]
Related party transaction expiration	2020-11
Related party transactions agreement extend period	1 year
Business Corporation Agreement \| Minimum
Related Party Transaction [Line Items]
Related party transaction agreement objection period	30 days
Youpin Commission Sales Agreement
Related Party Transaction [Line Items]
Related party transaction, expire date	Dec. 31, 2019
Related party transaction agreement termination notice period	30 days
Related party transaction renewed date	Dec. 31, 2020
Related party transaction commission percentage in sales excluding customer refunds	11.00%

Related Party Transactions - Schedule of Related Party Transactions (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items]
Other receivables	¥ 23,944		¥ 112,320		$ 3,439
Amount due to related parties	25,106		5,763		$ 3,606
Purchase from related parties	58,459		18,235	¥ 1,685
A related party	2,112,170	$ 303,394	1,311,852	739,464
Interest expense from related party			333	1,271
Xiaomi
Related Party Transaction [Line Items]
Accounts receivable from a related party	707,947		260,984
Sales receivable from related party	23,908		112,320
Other receivables	36
Advertising and promotion expenses payable	12,919		1,887
Purchase payable	12,187		3,876
Purchase from related parties	43,037		18,235	1,685
A related party	2,112,170		1,311,852	739,464
Commission expenses	58,874		20,824	3,327
Advertising and promotion expenses	22,977		3,774
Selling and marketing expenses, total	81,851		24,598	3,327
Interest expense from related party			440	1,761
Interest income			¥ 107	¥ 490
Foshan Wanwuhulian Trade Co., Limited
Related Party Transaction [Line Items]
Purchase from related parties	¥ 15,422

Related Party Transactions - Schedule of Related Party Transactions (Parenthetical) (Details) - Xiaomi ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)
Loan from Related Party
Related Party Transaction [Line Items]
Loan from related party \| ¥	¥ 31,900
Interest rate of loan	5.52%
Loan term	3 months
Extended loan term	3 months
Loan to Related Party
Related Party Transaction [Line Items]
Loan to related party \| $		$ 5,000
Description of interest rate	3 month Libor add 10bps
Basis spread on variable rate	0.10%	0.10%
Loan term	3 months
Extended loan term	3 months

Fair Value Measurements - Summary of Assets Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - Short-term Investment - CNY (¥)
¥ in Thousands

Dec. 31, 2019

Dec. 31, 2018

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

Assets measured at fair value

^[1]

¥ 316,201

¥ 168,993

Level 2

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

Assets measured at fair value

^[1]

¥ 316,201

¥ 168,993

[1]	Short-term investments represent structured deposits and the Company values these short-term investments based on quoted prices of similar products provided by banks at the end of each period, and accordingly, the Company classifies the valuation techniques that use these inputs as Level 2

Leases - Additional Information (Detail)	Dec. 31, 2019
Leases [Abstract]
Operating leases, weighted average discount rate	4.75%
Operating leases, weighted-average remaining lease term	2 years 4 months 24 days

Leases - Summary of Components of Lease Expense (Detail)
¥ in Thousands

12 Months Ended

Dec. 31, 2019

CNY (¥)

Lease cost

Operating lease expense

¥ 7,434

Short-term lease expense

798

^[1]

Total lease cost

¥ 8,232

[1]	Includes leases with a term of one year or less.

Leases - Supplemental Cash Flow Information for Leases (Detail) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)
Leases [Abstract]
Operating cash flows relating to operating leases	¥ 7,553
Lease liabilities arising from obtaining right-of-use assets	¥ 17,427

Leases - Schedule of Aggregate Future Minimum Rental Payments under Non-cancelable Agreement (Detail) - Dec. 31, 2019 ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)
Leases [Abstract]
2020	¥ 7,189
2021	5,985
2022	5,519
2023	3,511
Total future minimum rental payment	22,204
Less amount representing imputed interest	(1,820)
Present value of future minimum rental payments	20,384
Less current portion, recorded in other current liabilities	(6,993)	$ (1,004)
Long-term lease liabilities, recorded in other long-term liabilities	¥ 13,391	$ 1,923

Commitments and Contingencies - Schedule of Future Minimum Commitments under Non-Cancellable Agreements (Details) ¥ in Thousands	Dec. 31, 2018 CNY (¥)
Commitments And Contingencies Disclosure [Abstract]
2019	¥ 4,284
2020	2,947
2021	1,600
2022 and after	978
Total	¥ 9,809

Commitments and Contingencies - Schedule of Future Minimum Commitments of Short-Term Lease and Leases Not yet Commenced under Non-Cancellable Agreements (Details) ¥ in Thousands	Dec. 31, 2019 CNY (¥)
Commitments And Contingencies Disclosure [Abstract]
2020	¥ 1,351
2021	1,827
2022	1,876
2023 and after	681
Total	¥ 5,735

Commitments and Contingencies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019 CNY (¥)
Commitments And Contingencies Disclosure [Abstract]
Capital commitments outstanding	¥ 0

Restricted Net Assets - Additional Information (Detail) - CNY (¥)	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Amount of restricted net assets for consolidated and unconsolidated subsidiaries	¥ 31,395	¥ 13,750