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Share based Compensation - Expense Summary (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total equity compensation expense $ 7,054 $ 5,500 $ 20,873 $ 17,067
Research and development expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total equity compensation expense 2,905 2,390 8,603 7,456
Selling, general and administrative expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total equity compensation expense $ 4,149 $ 3,110 $ 12,270 $ 9,611