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Fair value of assets and liabilities - Xiaoying card loan products and Significant unobservable inputs (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2019
CNY (¥)
Fair value of assets and liabilities          
Financial guarantee derivative $ 103,416,108     ¥ 358,249,913 ¥ 719,962,262
Potential maximum undiscounted amount payable (Remaining estimated payment to ZhongAn based on the pre-agreed Cap at December 31, 2019) 207,080,370     2,350,198,084 1,441,652,114
Loans at fair value 399,657,112     33,417,119 2,782,332,885
Financial guarantee derivative          
Fair value of assets and liabilities          
Financial guarantee derivative 103,416,108       719,962,262
Financial guarantee derivative (103,416,108)     358,249,913 (719,962,262)
Estimated payment to ZhongAn based on the pre-agreed Cap 326,155,547 ¥ 2,270,629,689 $ (51,459,380) (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     370,958,304 155,618,319
Loan products          
Fair value of assets and liabilities          
Financial guarantee derivative 4,013,659,068     25,389,448,598 27,942,291,698
Loans at fair value $ 1,794,373,563     ¥ 12,811,666,471 ¥ 12,492,069,873
Remaining weighted average contractual term (Month) 7 months 4 days 7 months 4 days 7 months 16 days 7 months 16 days  
Estimated net default rate (in percentage) 10.13%     11.06% 10.13%