v3.26.1
Share-based compensation - Compensation cost (Details)
12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2025
USD ($)
Share-based compensation expense          
Share-based compensation expense ¥ 0   ¥ 0 ¥ 414,747  
Deferred tax benefit recognized 0   0 0  
Employee Stock Option | Origination and servicing          
Share-based compensation expense          
Share-based compensation expense       70,740  
Employee Stock Option | General and administrative          
Share-based compensation expense          
Share-based compensation expense       344,007  
Restricted stock units          
Share-based compensation expense          
Share-based compensation expense 60,966,646 $ 8,718,114 40,177,807 42,183,463  
Total unrecognized compensation expense ¥ 5,757,534   8,277,516 61,832,598 $ 823,316
weighted-average period (in years) 3 years 18 days 3 years 18 days      
Deferred tax benefit recognized ¥ 0   0 0  
Restricted stock units | Origination and servicing          
Share-based compensation expense          
Share-based compensation expense 24,122,338 $ 3,449,447 14,643,365 25,396,830  
Restricted stock units | General and administrative          
Share-based compensation expense          
Share-based compensation expense 32,997,428 4,718,570 22,078,845 16,617,520  
Restricted stock units | Borrower acquisitions and marketing          
Share-based compensation expense          
Share-based compensation expense ¥ 3,846,880 $ 550,097 ¥ 3,455,597 ¥ 169,113