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Short-term loan - Additional Information (Details)
¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2022
CNY (¥)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Oct. 31, 2022
CNY (¥)
Oct. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Apr. 30, 2021
CNY (¥)
Short-term Debt [Line Items]                
Short Term Loan   ¥ 5,000   $ 725     ¥ 150,000  
Repayments Of Short Term Debt   ¥ 188,000 $ 27,257          
VIE                
Short-term Debt [Line Items]                
Repayments Of Short Term Debt ¥ 150,000              
Shanghai Pudong Development Bank [Member] | Secured Debt [Member]                
Short-term Debt [Line Items]                
Short Term Loan               ¥ 150,000
Short-term Debt, Percentage Bearing Fixed Interest Rate               4.35%
Shenzhen Zhongxiaodan Micro Credit Co Ltd [Member] | Secured Debt [Member]                
Short-term Debt [Line Items]                
Short Term Loan         ¥ 5,000 $ 725    
Short-term Debt, Percentage Bearing Fixed Interest Rate         4.90% 4.90%