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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]        
Share-based compensation expense $ 1,168 $ 453 $ 3,385 $ 1,351
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 152 95 536 266
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 1,016 $ 358 $ 2,849 $ 1,085