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Fair value of assets and liabilities - Financial guarantee derivative movements (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Fair value of assets and liabilities                
Financial guarantee derivative           $ 103,416,108 ¥ 719,962,262 ¥ 358,249,913
Change in fair value of financial guarantee derivative $ 35,389,099 ¥ 246,371,828   ¥ 200,971,302 ¥ 18,110,752      
Potential maximum undiscounted amount payable (Remaining estimated payment to ZhongAn based on the pre-agreed Cap at December 31, 2019)           207,080,370 1,441,652,114 2,350,198,084
Financial guarantee derivative                
Fair value of assets and liabilities                
Financial guarantee derivative           103,416,108 719,962,262  
Financial guarantee derivative (103,416,108) (719,962,262)   358,249,913   (103,416,108) (719,962,262) 358,249,913
Balance at the beginning   358,249,913            
Estimated payment to ZhongAn based on the pre-agreed Cap 326,155,547 2,270,629,689 $ (51,459,380) (358,249,913)        
Less: Initially estimated net guarantee service fee to be collected 292,989,990 2,039,737,713            
Add (Less): Subsequent changes in estimated net guarantee service fee to be collected for outstanding loans 2,223,542 15,479,852            
Change in fair value of financial guarantee derivative 35,389,099 246,371,828            
Add: Guarantee service fee received from borrowers 269,741,374 1,877,885,497            
Less: Compensation paid to ZhongAn 357,087,201 2,485,969,674            
Balance at the end $ (103,416,108) (719,962,262)   358,249,913        
Potential maximum undiscounted amount payable (Remaining estimated payment to ZhongAn based on the pre-agreed Cap at December 31, 2019)           22,353,173 155,618,319 370,958,304
Changes in fair value related to balance outstanding           $ 17,289,174 ¥ 120,363,772  
Loans facilitated in 2018                
Fair value of assets and liabilities                
Financial guarantee derivative   (358,249,913)   (358,249,913)       (358,249,913)
Balance at the beginning   (358,249,913)            
Estimated payment to ZhongAn based on the pre-agreed Cap       1,784,817,072 53,260,916      
Less: Initially estimated net guarantee service fee to be collected       1,607,696,701        
Add (Less): Subsequent changes in estimated net guarantee service fee to be collected for outstanding loans       23,850,931        
Change in fair value of financial guarantee derivative       200,971,302        
Add: Guarantee service fee received from borrowers       1,019,863,268        
Less: Compensation paid to ZhongAn       1,632,345,399        
Balance at the end       (358,249,913)        
Potential maximum undiscounted amount payable (Remaining estimated payment to ZhongAn based on the pre-agreed Cap at December 31, 2019)               370,958,304
Changes in fair value related to balance outstanding               108,540,263
Loans facilitated in 2019                
Fair value of assets and liabilities                
Financial guarantee derivative   (52,105,289)   (52,105,289)       (52,105,289)
Balance at the beginning   ¥ (52,105,289)            
Estimated payment to ZhongAn based on the pre-agreed Cap       259,590,877 ¥ 7,746,479      
Less: Initially estimated net guarantee service fee to be collected       233,829,787        
Add (Less): Subsequent changes in estimated net guarantee service fee to be collected for outstanding loans       3,468,974        
Change in fair value of financial guarantee derivative       29,230,064        
Add: Guarantee service fee received from borrowers       148,332,960        
Less: Compensation paid to ZhongAn       237,414,792        
Balance at the end       ¥ (52,105,289)        
Potential maximum undiscounted amount payable (Remaining estimated payment to ZhongAn based on the pre-agreed Cap at December 31, 2019)               53,953,648
Changes in fair value related to balance outstanding               ¥ 15,786,527
Minimum | Default rates | Level 3                
Fair value of assets and liabilities                
Financial guarantee derivative input           9.62 9.62  
Maximum | Default rates | Level 3                
Fair value of assets and liabilities                
Financial guarantee derivative input           16.79 16.79