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Summary of significant accounting policies - Loan receivable from Xiaoying Housing Loans (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Loan receivable from Xiaoying Housing Loans            
Loans receivable from Xiaoying Credit Loans and Revolving Loans, net       $ 41,591,688 ¥ 289,553,016  
Xiaoying Housing Loan            
Loan receivable from Xiaoying Housing Loans            
Allowance for loan principal and interest receivables $ 6,925,150 ¥ 48,211,512 ¥ 25,911,367 6,925,150 48,211,512 ¥ 25,911,367
Loans receivable from Xiaoying Credit Loans and Revolving Loans, net       12,860,994 89,535,665 128,101,279
Loans receivable acquired during the year       9,719,909 67,668,067 184,822,069
Amount of outstanding undiscounted loan receivable       $ 24,534,818 ¥ 170,806,499 ¥ 195,077,545
Allowance for loans receivable at beginning of the year 3,721,935 25,911,367        
Provision for loan receivable from Xiaoying Housing Loans 3,365,601 23,430,641 40,347,875      
Less: Charge-offs (162,386) (1,130,496)        
Allowance for loans receivable at end of the year $ 6,925,150 ¥ 48,211,512 ¥ 25,911,367