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Summary of significant accounting policies - Others (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
$ / ¥
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
CNY (¥)
$ / ¥
Other disclosures          
Deposit payable to channel cooperators $ 15,645,876   ¥ 134,042,199   ¥ 108,923,460
Defined contribution plan cost 7,756,216 ¥ 53,997,224 51,979,823 ¥ 66,739,619  
Advertising cost $ 9,244,440 ¥ 64,357,939 192,483,874 68,838,176  
VAT rate (as a percent) 6.00% 6.00%      
VAT $ 33,246,292 ¥ 231,454,037 ¥ 301,758,965 ¥ 171,842,393  
Translation into USD 6.9618       6.9618
ZhongAn          
Other disclosures          
VAT rate (as a percent) 13.00% 13.00%