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Income Taxes - Summary of Reconciliation Between Expenses of 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 [Abstract]        
Loss before income tax ¥ (140,552) $ (22,055) ¥ (224,989) ¥ (109,679)
Income tax expense computed at PRC statutory rate (35,138) (5,514) (56,247)  
International tax rate differential 6,023 945 8,151  
Preferential tax rate 21,437 3,364 21,963  
Deferred tax items tax rate differential (22,935) (3,599) (23,337)  
Research and development super-deduction (32,595) (5,115) (27,455)  
Non-deductible expenses 8,092 1,270 7,132  
Deferred tax expense     347  
Recognition of prior year tax loss/ Expired prior year tax loss (4,851) (761) 3,382  
Changes in valuation allowance 59,999 9,415 66,150  
Income tax expense ¥ 32 $ 5 ¥ 86 ¥ 162