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Income Taxes - Summary of Income Tax Expense (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Income Tax Disclosure [Line Items]        
Deferred income tax (benefits) expenses       ¥ 184
Subtotal income tax expenses applicable to PRC operations ¥ 79 $ 11 ¥ 134 206
Subtotal income tax expenses applicable to Non-PRC operations 79 11 134 206
Total income tax expenses 79 11 134 206
Non-PRC [Member]        
Income Tax Disclosure [Line Items]        
Current income tax expenses 17 2 21 0
Subtotal income tax expenses applicable to PRC operations 17 2 21 0
Current income tax expenses 17 2 21 0
Subtotal income tax expenses applicable to Non-PRC operations 17 2 21 0
Total income tax expenses 17 2 21 0
PRC [Member]        
Income Tax Disclosure [Line Items]        
Current income tax expenses 62 9 113 22
Deferred income tax (benefits) expenses 0 0 0 184
Subtotal income tax expenses applicable to PRC operations 62 9 113 206
Current income tax expenses 62 9 113 22
Subtotal income tax expenses applicable to Non-PRC operations 62 9 113 206
Total income tax expenses ¥ 62 $ 9 ¥ 113 ¥ 206