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Income Taxes - Summary of Composition of Income Tax Expense (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Income Tax Disclosure [Abstract]        
Current income tax expense ¥ (32) $ (5) ¥ (86) ¥ (162)
Deferred tax benefit 0 0    
Total income tax expense ¥ (32) $ (5) ¥ (86) ¥ (162)