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Short term borrowings (Details) - CNY (¥)
Dec. 31, 2022
Dec. 31, 2021
Short term borrowings    
Short-term borrowings ¥ 289,062,000 ¥ 815,260,000
Restricted cash ¥ 198,320,000 ¥ 1,043,718,000
Weighted average    
Short term borrowings    
Interest rate (in percent) 4.61% 3.93%
Secured    
Short term borrowings    
Short-term borrowings   ¥ 663,136,000
Secured | Beijing Haidian    
Short term borrowings    
Short-term borrowings ¥ 9,014,000  
Secured | Shenzhen HTI Financing Guarantee Co., Ltd    
Short term borrowings    
Short-term borrowings 53,722,000  
Unsecured    
Short term borrowings    
Short-term borrowings 289,062,000 ¥ 152,124,000
Borrowings secured by restricted cash    
Short term borrowings    
Short-term borrowings 597,400,000  
Restricted cash 670,022,000  
Borrowings guaranteed by the accounts receivable | BER Technology    
Short term borrowings    
Short-term borrowings ¥ 3,000,000