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Share-based compensation - Summary of share-based compensation expense and unrecognized costs (Details) - 2014 Plan - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2021
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based compensation            
Increase in authorized shares 8,601,471 12,601,471        
Share-based compensation expense     $ 5,950 $ 6,363 $ 18,725 $ 16,417
Unrecognized compensation costs     55,198   $ 55,198  
Weighted-average remaining period for recognition (in years)         2 years 6 months 25 days  
Research and development expenses            
Share-based compensation            
Share-based compensation expense     3,245 3,906 $ 9,205 9,177
Selling, general and administrative expense            
Share-based compensation            
Share-based compensation expense     2,705 2,457 9,520 7,240
Share options            
Share-based compensation            
Share-based compensation expense     2,965 3,994 9,155 8,948
Unrecognized compensation costs     31,952   $ 31,952  
Weighted-average remaining period for recognition (in years)         2 years 11 months 4 days  
Restricted share units ("RSUs")            
Share-based compensation            
Share-based compensation expense     2,582 1,525 $ 8,364 5,178
Unrecognized compensation costs     21,887   $ 21,887  
Weighted-average remaining period for recognition (in years)         2 years 1 month 28 days  
Performance share units ("PSUs")            
Share-based compensation            
Share-based compensation expense     403 $ 844 $ 1,206 $ 2,291
Unrecognized compensation costs     $ 1,359   $ 1,359  
Weighted-average remaining period for recognition (in years)         9 months 3 days