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Stock award plan Stock award plan - Share-based compensation expense (Details) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Stock option plan    
Share-based compensation expense $ 9,029 $ 8,915
Research and development    
Stock option plan    
Share-based compensation expense 4,467 4,328
Selling, general and administrative    
Stock option plan    
Share-based compensation expense $ 4,562 $ 4,587