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Income taxes - Tax rates (Details)
12 Months Ended 36 Months Ended
Dec. 31, 2019
USD ($)
subsidiary
Dec. 31, 2019
CNY (¥)
subsidiary
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
USD ($)
Income taxes          
Income tax rate (as a percent) 25.00% 25.00%      
Income tax benefit (expense) $ (13,373,358) ¥ (93,102,643) ¥ 209,921,188 ¥ 138,248,227  
Tax holiday period (in years) 2 years 2 years      
Subsidiaries in Shenzhen | Tax year 2019 to 2021 | PRC          
Income taxes          
Income tax rate (as a percent) 12.50% 12.50%      
Hong Kong          
Income taxes          
Income tax rate (as a percent) 16.50% 16.50%      
Income tax benefit (expense) | $         $ 0
PRC          
Income taxes          
Income tax rate (as a percent) 25.00% 25.00%      
Statute of limitations period (in years) 3 years 3 years      
Extension period for statute of limitations under special circumstances (in years) 5 years 5 years      
Underpayment of tax liability listed as special circumstance | ¥   ¥ 100,000      
Statute of limitations period for related party transaction (in years) 10 years 10 years      
Statute of limitations period for tax evasion (in years) 0 years 0 years      
Qualified software enterprise | PRC          
Income taxes          
Number of subsidiary | subsidiary 1 1      
Tax reduction (as a percent) 50.00% 50.00%      
Tax reduction period (in years) 3 years 3 years