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Share-Based Compensation - Share-Based Compensation Expense (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 [Line Items]        
Total share-based compensation expense $ 773 $ 229 $ 1,639 $ 1,090
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation expense 523 58 643 240
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation expense $ 250 $ 171 $ 996 $ 850