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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - STOCK BASED COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses $ 3,945 $ 2,058 $ 6,906 $ 3,750
Research and development        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses 1,590 1,012 2,896 1,867
General and administrative        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses $ 2,355 $ 1,046 $ 4,010 $ 1,883