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Revenue From Contracts With Customers - Additional Informational (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2021
USD ($)
Contract With Customer Asset And Liability [Line Items]          
Contract with customer, liability, revenue recognized ¥ 117,800 $ 18,500 ¥ 57,400 ¥ 4,000  
Deferred income,current ¥ 2,900   16,600   $ 400
Revenue, remaining performance obligation, expected timing of satisfaction, explanation future periods upon the usage of the prepaid card balances to purchase the Group’s products. future periods upon the usage of the prepaid card balances to purchase the Group’s products.      
Contract with customer liability, current ¥ 96,800   57,100   15,200
Loyalty Points Program [Member]          
Contract With Customer Asset And Liability [Line Items]          
Revenue, remaining performance obligation, expected timing of satisfaction, explanation will be recognized as revenues when the points are redeemed will be recognized as revenues when the points are redeemed      
Membership [Member]          
Contract With Customer Asset And Liability [Line Items]          
Deferred income,current ¥ 143,800   ¥ 66,765   $ 22,600
Membership [Member] | Minimum [Member]          
Contract With Customer Asset And Liability [Line Items]          
Revenue, remaining performance obligation, expected timing of satisfaction, period 1 month       1 month
Membership [Member] | Maximum [Member]          
Contract With Customer Asset And Liability [Line Items]          
Revenue, remaining performance obligation, expected timing of satisfaction, period 12 months       12 months
Corporate Customers [Member] | Minimum [Member]          
Contract With Customer Asset And Liability [Line Items]          
Revenue from contract with customers, Billing terms 7 days 7 days      
Corporate Customers [Member] | Maximum [Member]          
Contract With Customer Asset And Liability [Line Items]          
Revenue from contract with customers, Billing terms 30 days 30 days