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Fair value of assets and liabilities - Financial Instruments Recorded at Fair Value on a Recurring Basis (Details)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Assets        
Loans at fair value $ 399,657,112 ¥ 2,782,332,885 ¥ 33,417,119  
Financial guarantee derivative 103,416,108 719,962,262 358,249,913  
Total assets 503,073,220 3,502,295,147    
Liabilities        
Payable to investors at fair value 431,835,082 3,006,349,475    
Recurring        
Assets        
Loans at fair value 399,657,112 2,782,332,885 33,417,119  
Financial guarantee derivative 103,416,108 719,962,262 358,249,913  
Total assets     391,667,032  
Liabilities        
Payable to investors at fair value 431,835,082 3,006,349,475    
Total liabilities (431,835,082) (3,006,349,475)    
Level 3        
Assets        
Total assets 503,073,220 3,502,295,147    
Level 3 | Recurring        
Assets        
Loans at fair value 399,657,112 2,782,332,885 33,417,119 ¥ 667,838,880
Financial guarantee derivative 103,416,108 719,962,262 358,249,913  
Total assets     ¥ 391,667,032  
Liabilities        
Payable to investors at fair value 431,835,082 3,006,349,475   ¥ 667,080,871
Total liabilities $ (431,835,082) ¥ (3,006,349,475)