Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Share-Based Compensation (Details)

v3.20.4
Stockholders' Equity - Share-Based Compensation (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]      
Share-based compensation expense $ 30,727 $ 24,515 $ 20,846
Research and development expenses      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 13,497 9,641 8,352
General and administrative expenses      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 17,230 $ 14,874 $ 12,494