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Restricted cash and time deposits over three months (Details)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Restricted cash        
Pledged bank deposits ¥ 198,320,000   ¥ 1,043,718,000  
Accrued interests 1,238,000   6,444,000  
Time deposits with initial terms over three months 144,256,000   10,265,000  
Restricted cash ¥ 343,814,000   ¥ 1,060,427,000  
Weighted average        
Restricted cash        
Interest rate (in percent) 4.61% 4.61% 3.93% 3.93%
Short-term borrowings        
Restricted cash        
Pledged bank deposits     ¥ 670,022,000 $ 105,090,000
Short-term borrowings | Weighted average        
Restricted cash        
Interest rate (in percent)     0.94% 0.94%
Business guarantee        
Restricted cash        
Pledged bank deposits ¥ 5,331,000   ¥ 4,830,000  
Currency forwards and swaps        
Restricted cash        
Pledged bank deposits ¥ 192,989,000 $ 27,710,000 ¥ 368,866,000 $ 57,855,000