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Share based Compensation - Expense Summary (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total equity compensation expense $ 49,151 $ 44,430 $ 29,260
Research and development expense      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total equity compensation expense 20,817 17,575 11,740
Selling, general, and administrative expense      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total equity compensation expense $ 28,334 $ 26,855 $ 17,520