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Income Taxes - Summary of Profit / (Loss) Before Income Taxes (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 [Line Items]        
Total loss before income taxes ¥ (140,552) $ (22,055) ¥ (224,989) ¥ (109,679)
Cayman Islands        
Income Tax Disclosure [Line Items]        
Total loss before income taxes (23,555) (3,696) (31,966) (16,716)
British Virgin Islands        
Income Tax Disclosure [Line Items]        
Total loss before income taxes (2)   (27) (30)
Hong Kong        
Income Tax Disclosure [Line Items]        
Total loss before income taxes (1,564) (245) (1,790) (3,097)
China        
Income Tax Disclosure [Line Items]        
Total loss before income taxes ¥ (115,431) $ (18,114) ¥ (191,206) ¥ (89,836)