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Share based Compensation - Expense Summary (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total equity compensation expense $ 6,341 $ 5,537 $ 13,819 $ 11,567
Research and development expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total equity compensation expense 2,641 2,313 5,698 5,066
Selling, general and administrative expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total equity compensation expense $ 3,700 $ 3,224 $ 8,121 $ 6,501