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Stock award plan - Share-based compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Stock option plan        
Share-based compensation expense $ 8,942 $ 7,168 $ 24,773 $ 24,082
Research and development        
Stock option plan        
Share-based compensation expense 4,431 3,624 12,109 11,986
Selling, general and administrative        
Stock option plan        
Share-based compensation expense $ 4,511 $ 3,544 $ 12,664 $ 12,096