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Stock award plan (Details 5) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based compensation expense recorded in the statement of operations      
Share-based compensation expense $ 35,009 $ 33,979 $ 19,310
Research and development      
Share-based compensation expense recorded in the statement of operations      
Share-based compensation expense 16,812 16,138 9,739
Total      
Share-based compensation expense recorded in the statement of operations      
Share-based compensation expense $ 18,197 $ 17,841 $ 9,571