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Share-based compensation - Summary of share-based compensation expense and unrecognized costs (Details) - 2014 Plan - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Share-based compensation          
Authorized shares 12,601,471   12,601,471    
Increase in authorized shares     4,000,000    
Share-based compensation expense $ 7,021 $ 5,714 $ 12,775 $ 10,054  
Unrecognized compensation costs 60,607   $ 60,607    
Weighted-average remaining period for recognition (in years)     2 years 7 months 28 days    
Research and development expenses          
Share-based compensation          
Share-based compensation expense 3,286 2,889 $ 5,960 5,271  
Selling, general and administrative expense          
Share-based compensation          
Share-based compensation expense 3,735 2,825 6,815 4,783  
Share options          
Share-based compensation          
Share-based compensation expense $ 3,350 2,746 $ 6,190 4,954  
Outstanding of fully vested share options 3,417,931   3,417,931   2,659,279
Unrecognized compensation costs $ 34,855   $ 34,855    
Weighted-average remaining period for recognition (in years)     2 years 11 months 26 days    
Restricted share units ("RSUs")          
Share-based compensation          
Share-based compensation expense 3,222 2,209 $ 5,782 3,653  
Unrecognized compensation costs 24,960   $ 24,960    
Weighted-average remaining period for recognition (in years)     2 years 3 months    
Performance share units ("PSUs")          
Share-based compensation          
Share-based compensation expense 449 $ 759 $ 803 $ 1,447  
Unrecognized compensation costs $ 792   $ 792    
Weighted-average remaining period for recognition (in years)     6 months 29 days