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Share-Based Compensation - Share Based Compensation Allocation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award        
Total share-based compensation $ 1,502 $ 4,245 $ 2,112 $ 15,786
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award        
Total share-based compensation 556 2,183 (238) 10,450
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award        
Total share-based compensation 946 2,062 2,350 5,423
Capitalized        
Share-based Compensation Arrangement by Share-based Payment Award        
Total share-based compensation $ 0 $ 0 $ 0 $ (87)