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Stock award plan - Share-based compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stock option plan        
Share-based compensation expense $ 7,885 $ 8,736 $ 16,914 $ 17,651
Research and development        
Stock option plan        
Share-based compensation expense 3,895 4,087 8,362 8,415
Selling, general and administrative        
Stock option plan        
Share-based compensation expense $ 3,990 $ 4,649 $ 8,552 $ 9,236