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Share-based compensation - Summary of share-based compensation expense and unrecognized costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
May 31, 2018
2014 Plan            
Share-based compensation            
Authorized shares   8,601,471   8,601,471   3,000,000
Share-based compensation expense $ 4,576 $ 2,205 $ 8,854 $ 4,732    
Increase in share-based compensation expense 2,400   4,100      
Unrecognized compensation costs 38,517   $ 38,517      
Weighted-average remaining period for recognition (in years)     2 years 7 months 28 days      
Research and development expenses | 2014 Plan            
Share-based compensation            
Share-based compensation expense 2,119 993 $ 4,099 1,799    
Selling, general and administrative expense | 2014 Plan            
Share-based compensation            
Share-based compensation expense 2,457 1,212 4,755 2,933    
Share options | 2014 Plan            
Share-based compensation            
Share-based compensation expense $ 2,004 1,096 $ 4,080 2,155    
Outstanding of fully vested share options 2,943,756   2,943,756   2,673,712  
Unrecognized compensation costs $ 21,695   $ 21,695      
Weighted-average remaining period for recognition (in years)     3 years 29 days      
Share options | 2012 Plan            
Share-based compensation            
Outstanding of fully vested share options 14,000   14,000   32,567  
Restricted share units ("RSUs") | 2014 Plan            
Share-based compensation            
Share-based compensation expense $ 995 540 $ 1,925 1,286    
Unrecognized compensation costs 6,955   $ 6,955      
Weighted-average remaining period for recognition (in years)     2 years 1 month 6 days      
Performance share units ("PSUs") | 2014 Plan            
Share-based compensation            
Share-based compensation expense 1,577 $ 569 $ 2,849 $ 1,291    
Unrecognized compensation costs $ 9,867   $ 9,867      
Weighted-average remaining period for recognition (in years)     2 years 1 month 13 days