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Share-based compensation - Compensation cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based compensation        
Share-based compensation expense $ 2,447 $ 923 $ 5,978 $ 5,020
Unrecognized compensation costs 14,791   $ 14,791  
Weighted-average remaining period for recognition (in years)     2 years 1 month 10 days  
Research and development expenses | Employees        
Share-based compensation        
Share-based compensation expense 1,131 893 $ 2,612 2,670
Research and development expenses | Non-employees        
Share-based compensation        
Share-based compensation expense       670
Selling, general and administrative expense | Employees        
Share-based compensation        
Share-based compensation expense 1,316 30 3,366 1,680
Share options        
Share-based compensation        
Share-based compensation expense 638 718 2,347 4,408
Unrecognized compensation costs 7,041   $ 7,041  
Weighted-average remaining period for recognition (in years)     2 years 6 months 7 days  
Restricted share units ("RSUs")        
Share-based compensation        
Share-based compensation expense 728 88 $ 1,960 323
Unrecognized compensation costs 4,003   $ 4,003  
Weighted-average remaining period for recognition (in years)     1 year 7 months 21 days  
Performance share units ("PSUs")        
Share-based compensation        
Share-based compensation expense 1,081 $ 117 $ 1,671 $ 289
Unrecognized compensation costs $ 3,747   $ 3,747  
Weighted-average remaining period for recognition (in years)     1 year 10 months 2 days