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Income Taxes - Additional Information (Details)
¥ in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2021
CNY (¥)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
CNY (¥)
Income Tax Disclosure [Line Items]      
Income tax expenses ¥ 11 $ 2 ¥ 0
Effective income tax rate 0.03% 0.03% 0.00%
Hong Kong      
Income Tax Disclosure [Line Items]      
Effective profits tax rate 16.50% 16.50%  
PRC      
Income Tax Disclosure [Line Items]      
Effective statutory enterprise income tax rate 25.00% 25.00%