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Stock award plan (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based compensation expense recorded in the statement of operations      
Share-based compensation expense $ 33,979 $ 19,310 $ 8,427
Unrecognized compensation cost $ 73,800    
Weighted average remaining service period for recognition of unrecognized compensation cost 2 years 8 months 27 days    
Research and development      
Share-based compensation expense recorded in the statement of operations      
Share-based compensation expense $ 16,138 9,739 4,312
Selling, general and administrative      
Share-based compensation expense recorded in the statement of operations      
Share-based compensation expense $ 17,841 $ 9,571 $ 4,115