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Share-based compensation - Compensation cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based compensation      
Share-based compensation expense $ 6,214 $ 11,617 $ 8,396
Unrecognized compensation costs $ 9,977    
Weighted-average service period over which unrecognized compensation costs will be recognized 2 years 6 months 11 days    
Research and development expenses      
Share-based compensation      
Share-based compensation expense $ 3,972 8,591 6,563
Selling, general and administrative expense      
Share-based compensation      
Share-based compensation expense 2,242 3,026 1,833
Research and development, excluding 4D      
Share-based compensation      
Share-based compensation expense 3,302 2,162 2,476
Share options      
Share-based compensation      
Share-based compensation expense 5,187 10,469 7,966
Unrecognized compensation costs $ 7,370    
Weighted-average service period over which unrecognized compensation costs will be recognized 2 years 9 months 22 days    
Restricted share units ("RSUs")      
Share-based compensation      
Share-based compensation expense $ 528 $ 1,148 $ 430
Unrecognized compensation costs $ 2,119    
Weighted-average service period over which unrecognized compensation costs will be recognized 1 year 9 months 15 days    
Performance share units ("PSUs")      
Share-based compensation      
Share-based compensation expense $ 499    
Unrecognized compensation costs $ 488    
Weighted-average service period over which unrecognized compensation costs will be recognized 1 year 5 months 23 days