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Share-based compensation - Restricted stocks unit (Details)
12 Months Ended
Nov. 20, 2019
shares
Aug. 13, 2019
shares
Apr. 15, 2019
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2019
CNY (¥)
¥ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration term       10 years 10 years
Stock options cancelled (in shares)       3,452,998 3,452,998
Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting term       3 years 3 years
Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting term       4 years 4 years
Restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares granted       3,689,400 3,689,400
Expiration term     0 years 10 years 10 years
Share-based Goods and Nonemployee Services Transaction, Modification of Terms, Incremental Compensation Cost       $ 51,796 ¥ 360,592
Number of Restricted Shares          
Granted (in shares)       3,689,400 3,689,400
Vested (in shares)       49,998 49,998
Outstanding ending balance (in shares)       3,639,402 3,639,402
Weighted-Average Grant-Date Fair Value          
Granted (in dollars per share) | ¥ / shares         ¥ 8.21
Vested (in dollars per share) | ¥ / shares         17.60
Outstanding ending balance (in dollars per share) | ¥ / shares         ¥ 8.21
Restricted stock units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting term     2 years 3 years 3 years
Restricted stock units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting term     3 years 4 years 4 years
Restricted stock units | Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares granted     150,000    
Number of Restricted Shares          
Granted (in shares)     150,000    
Restricted stock units | Certain employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares granted 1,789,400        
Number of Restricted Shares          
Granted (in shares) 1,789,400        
Restricted stock units | Certain senior managements          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares granted 250,000 1,500,000      
Stock options cancelled (in shares) 250,000 1,500,000      
Number of Restricted Shares          
Granted (in shares) 250,000 1,500,000