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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - STOCK BASED COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses $ 2,063 $ 2,008 $ 5,813 $ 5,775
Research and development        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses 932 924 2,799 2,655
General and administrative        
Stock-Based Compensation Expense        
Stock-based compensation expense included in operating expenses $ 1,131 $ 1,084 $ 3,014 $ 3,120