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Share-based payments - Additional information (Details)
3 Months Ended
Mar. 31, 2020
Options
$ / shares
Dec. 31, 2019
Options
Option plans    
Number of instruments outstanding 2,397,600 2,449,498
2012 and 2019 Employee Stock Option Plan (ESOP)    
Option plans    
Number of instruments outstanding 2,068,775  
Number of instruments vested 1,138,775  
Number of instruments unvested 930,000  
2015 Restricted Stock Unit Plan (RSU)    
Option plans    
Number of instruments outstanding 328,825 365,723
Number of instruments vested 701  
Number of instruments unvested 328,124  
Weighted average price for share options exercised | $ / shares $ 0