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Stock award plan - Share-based compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Stock option plan        
Share-based compensation expense $ 10,484 $ 8,942 $ 30,668 $ 24,773
Research and development        
Stock option plan        
Share-based compensation expense 4,988 4,431 15,191 12,109
Selling, general and administrative        
Stock option plan        
Share-based compensation expense $ 5,496 $ 4,511 $ 15,477 $ 12,664