Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details

Significant Accounting Policies - Schedule of Disaggregation of Revenue by Type of Contract (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)
Disaggregation Of Revenue [Line Items]
Revenue	¥ 5,303,835	$ 832,288	¥ 5,825,624	¥ 4,647,513
Sales to Xiaomi
Disaggregation Of Revenue [Line Items]
Revenue	2,295,569		2,889,441	2,112,170
Sales to Xiaomi \| Xiaomi-branded Products
Disaggregation Of Revenue [Line Items]
Revenue	2,021,117		2,560,787	1,859,499
Sales to Xiaomi \| Viomi-branded Products
Disaggregation Of Revenue [Line Items]
Revenue	274,452		326,114	250,593
Sales to Xiaomi \| Rendering of Services
Disaggregation Of Revenue [Line Items]
Revenue			2,540	2,078
Sales to Third Party Customers
Disaggregation Of Revenue [Line Items]
Revenue	¥ 3,008,266		¥ 2,936,183	¥ 2,535,343