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Short-term loan - Additional Information (Details)
¥ in Thousands, $ in Thousands
1 Months Ended
Apr. 30, 2021
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Apr. 30, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Short-term Debt [Line Items]                
Short Term Loan   ¥ 150,000 $ 23,538   ¥ 0      
short-term loan, Restricted Cash   164,030 25,740   ¥ 115 $ 18 ¥ 115 ¥ 115
VIE                
Short-term Debt [Line Items]                
short-term loan, Restricted Cash   ¥ 157,900 $ 24,778          
Shanghai Pudong Development Bank [Member] | Secured Debt [Member]                
Short-term Debt [Line Items]                
Short Term Loan ¥ 150,000     $ 23,538        
Short-term Debt, Percentage Bearing Fixed Interest Rate 4.35%     4.35%        
Short-term Debt, Terms one-year