XML 47 R37.htm IDEA: XBRL DOCUMENT v3.19.1
Share-based compensation - Summary of share-based compensation expense and unrecognized costs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Jun. 30, 2018
May 31, 2018
2014 Plan          
Share-based compensation          
Authorized shares       8,601,471 3,000,000
Share-based compensation expense $ 4,279 $ 2,527      
Unrecognized compensation costs $ 40,256        
Weighted-average remaining period for recognition (in years) 2 years 9 months 26 days        
Research and development expenses | 2014 Plan          
Share-based compensation          
Share-based compensation expense $ 1,980 806      
Selling, general and administrative expense | 2014 Plan          
Share-based compensation          
Share-based compensation expense 2,298 1,721      
Share options | 2014 Plan          
Share-based compensation          
Share-based compensation expense $ 2,076 1,059      
Outstanding of fully vested share options 2,969,444   2,673,712    
Unrecognized compensation costs $ 22,627        
Weighted-average remaining period for recognition (in years) 3 years 3 months        
Share options | 2012 Plan          
Share-based compensation          
Outstanding of fully vested share options 14,000   32,567    
Restricted share units ("RSUs") | 2014 Plan          
Share-based compensation          
Share-based compensation expense $ 930 746      
Unrecognized compensation costs $ 7,968        
Weighted-average remaining period for recognition (in years) 2 years 3 months 22 days        
Performance share units ("PSUs") | 2014 Plan          
Share-based compensation          
Share-based compensation expense $ 1,272 $ 722      
Unrecognized compensation costs $ 9,661        
Weighted-average remaining period for recognition (in years) 2 years 2 months 19 days