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Summary of significant accounting policies - Accounts receivable and contract assets and allowance for uncollectible accounts receivable and contract assets (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 (¥)
Accounts, Notes and Loans Receivables            
Accounts receivable gross       $ 138,479,152 ¥ 964,064,156 ¥ 1,600,506,569
Allowance for doubtful accounts $ (27,709,775) ¥ (192,909,907) ¥ (221,213,326) (27,709,775) (192,909,907) (221,213,326)
Accounts receivable and contract assets, net       110,769,377 771,154,249 1,379,293,243
Provision for accounts receivable and contract assets            
Allowance for accounts receivable and contract assets, Beginning balance 31,775,307 221,213,326 175,799,647      
Provision for doubtful accounts 34,644,319 241,186,823 393,438,672      
Provision for contract assets     3,557,738      
Charge-off for accounts receivable 38,709,851 269,490,242 337,206,443      
Charge-off for contract assets     (14,376,288)      
Allowance for accounts receivable and contract assets, Ending balance 27,709,775 192,909,907 221,213,326      
Not past-due accounts receivables       128,915,225 897,482,010 1,510,125,550
1 - 30 days            
Accounts, Notes and Loans Receivables            
Past-due accounts receivables       4,816,553 33,531,873 45,841,476
30 - 60 days            
Accounts, Notes and Loans Receivables            
Past-due accounts receivables       4,747,374 33,050,273 44,539,543
Loan facilitation service            
Accounts, Notes and Loans Receivables            
Accounts receivable gross       135,880,905 945,975,681 1,539,375,801
Post-origination service            
Accounts, Notes and Loans Receivables            
Accounts receivable gross       2,598,247 18,088,475 61,130,768
Xiaoying Credit Loan            
Accounts, Notes and Loans Receivables            
Accounts receivable gross       129,687,810 902,860,598 1,561,638,795
Allowance for doubtful accounts (26,585,802) (185,085,029) (206,575,845) (26,585,802) (185,085,029) (206,575,845)
Accounts receivable and contract assets, net       103,102,008 717,775,569 1,355,062,950
Provision for accounts receivable and contract assets            
Allowance for accounts receivable and contract assets, Beginning balance 29,672,764 206,575,845 159,791,649      
Provision for doubtful accounts 33,122,081 230,589,301 393,205,248      
Provision for contract assets     3,557,738      
Charge-off for accounts receivable 36,209,043 252,080,117 335,602,502      
Charge-off for contract assets     (14,376,288)      
Allowance for accounts receivable and contract assets, Ending balance 26,585,802 185,085,029 206,575,845      
Not past-due accounts receivables       120,329,209 837,707,889 1,473,621,949
Xiaoying Credit Loan | 1 - 30 days            
Accounts, Notes and Loans Receivables            
Past-due accounts receivables       4,702,706 32,739,296 44,653,954
Xiaoying Credit Loan | 30 - 60 days            
Accounts, Notes and Loans Receivables            
Past-due accounts receivables       4,655,895 32,413,413 43,362,892
Xiaoying Credit Loan | Loan facilitation service            
Accounts, Notes and Loans Receivables            
Accounts receivable gross       127,115,753 884,954,449 1,501,967,864
Xiaoying Credit Loan | Post-origination service            
Accounts, Notes and Loans Receivables            
Accounts receivable gross       2,572,057 17,906,149 59,670,931
Xiaoying Revolving Loan            
Accounts, Notes and Loans Receivables            
Accounts receivable gross       4,178,702 29,091,285  
Allowance for doubtful accounts (1,123,973) (7,824,878)   (1,123,973) (7,824,878)  
Accounts receivable and contract assets, net       3,054,729 21,266,407  
Provision for accounts receivable and contract assets            
Provision for doubtful accounts 1,480,076 10,303,996        
Charge-off for accounts receivable 356,103 2,479,118        
Allowance for accounts receivable and contract assets, Ending balance 1,123,973 7,824,878        
Not past-due accounts receivables       3,973,376 27,661,848  
Xiaoying Revolving Loan | 1 - 30 days            
Accounts, Notes and Loans Receivables            
Past-due accounts receivables       113,847 792,577  
Xiaoying Revolving Loan | 30 - 60 days            
Accounts, Notes and Loans Receivables            
Past-due accounts receivables       91,479 636,860  
Xiaoying Revolving Loan | Loan facilitation service            
Accounts, Notes and Loans Receivables            
Accounts receivable gross       4,160,077 28,961,624  
Xiaoying Revolving Loan | Post-origination service            
Accounts, Notes and Loans Receivables            
Accounts receivable gross       18,625 129,661  
Xiaoying Housing Loan            
Accounts, Notes and Loans Receivables            
Accounts receivable gross       134,267 934,741 5,442,210
Allowance for doubtful accounts (17,182) (119,616) (119,616)     (119,616)
Accounts receivable and contract assets, net       134,267 934,741 5,322,594
Provision for accounts receivable and contract assets            
Allowance for accounts receivable and contract assets, Beginning balance 17,182 119,616 418,187      
Provision for doubtful accounts     51,241      
Charge-off for accounts receivable 17,182 119,616 349,812      
Allowance for accounts receivable and contract assets, Ending balance     119,616      
Not past-due accounts receivables       134,267 934,741 5,442,210
Xiaoying Housing Loan | Loan facilitation service            
Accounts, Notes and Loans Receivables            
Accounts receivable gross       127,873 890,225 5,183,029
Xiaoying Housing Loan | Post-origination service            
Accounts, Notes and Loans Receivables            
Accounts receivable gross       6,394 44,516 259,181
Internet Channel            
Accounts, Notes and Loans Receivables            
Accounts receivable gross       4,478,373 31,177,532 18,013,345
Allowance for doubtful accounts (19,206) (133,707) (133,707)     (133,707)
Accounts receivable and contract assets, net       4,478,373 31,177,532 17,879,638
Provision for accounts receivable and contract assets            
Allowance for accounts receivable and contract assets, Beginning balance 19,206 133,707 138,592      
Provision for doubtful accounts     44,227      
Charge-off for accounts receivable 19,206 133,707 49,112      
Allowance for accounts receivable and contract assets, Ending balance     133,707      
Not past-due accounts receivables       4,478,373 31,177,532 18,013,345
Internet Channel | Loan facilitation service            
Accounts, Notes and Loans Receivables            
Accounts receivable gross       4,477,202 31,169,383 17,546,683
Internet Channel | Post-origination service            
Accounts, Notes and Loans Receivables            
Accounts receivable gross       $ 1,171 ¥ 8,149 466,662
Other Products            
Accounts, Notes and Loans Receivables            
Accounts receivable gross           15,412,219
Allowance for doubtful accounts (2,066,155) (14,384,158) (14,384,158)     (14,384,158)
Accounts receivable and contract assets, net           1,028,061
Provision for accounts receivable and contract assets            
Allowance for accounts receivable and contract assets, Beginning balance 2,066,155 14,384,158 15,451,219      
Provision for doubtful accounts 42,162 293,526 137,956      
Charge-off for accounts receivable $ 2,108,317 ¥ 14,677,684 1,205,017      
Allowance for accounts receivable and contract assets, Ending balance     ¥ 14,384,158      
Not past-due accounts receivables           13,048,046
Other Products | 1 - 30 days            
Accounts, Notes and Loans Receivables            
Past-due accounts receivables           1,187,522
Other Products | 30 - 60 days            
Accounts, Notes and Loans Receivables            
Past-due accounts receivables           1,176,651
Other Products | Loan facilitation service            
Accounts, Notes and Loans Receivables            
Accounts receivable gross           14,678,225
Other Products | Post-origination service            
Accounts, Notes and Loans Receivables            
Accounts receivable gross           ¥ 733,994