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Share-based compensation (Details)
12 Months Ended
Apr. 30, 2019
shares
Oct. 31, 2018
shares
May 10, 2018
USD ($)
May 10, 2018
CNY (¥)
May 09, 2018
USD ($)
shares
May 09, 2018
CNY (¥)
¥ / shares
shares
Apr. 30, 2018
shares
Oct. 11, 2017
shares
May 03, 2016
shares
Jun. 29, 2015
shares
Jan. 25, 2015
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2019
CNY (¥)
¥ / shares
shares
Dec. 31, 2018
CNY (¥)
¥ / shares
Dec. 31, 2017
CNY (¥)
Share-based compensation                              
Number of shares granted | shares 155,000 475,000     40,000,000 40,000,000 841,054 16,616,000 7,425,000 630,000 13,843,645 155,000 155,000    
Expiration period (in years)                       10 years 10 years    
Exercise price (in dollars per share)           ¥ 4.75                  
Share-based compensation expense     $ 1,332,770 ¥ 9,163,461 $ 2,357,666 ¥ 16,210,135           $ 21,681,689 ¥ 150,943,580 ¥ 171,836,485 ¥ 74,009,575
Service period (in years)         5 years 5 years                  
Weighted-average grant date fair value of the options                         ¥ 10.33 ¥ 13.08  
Minimum                              
Share-based compensation                              
Vesting period (in years)                       3 years 3 years    
Maximum                              
Share-based compensation                              
Vesting period (in years)                       4 years 4 years    
Exercise price (in dollars per share)                         ¥ 31.96