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STOCK-BASED COMPENSATION, Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Stock-Based Compensation Expense [Abstract]        
Stock-based compensation expense $ 879 $ 1,154 $ 2,062 $ 1,573
Research and Development [Member]        
Stock-Based Compensation Expense [Abstract]        
Stock-based compensation expense 470 168 892 570
General and Administrative [Member]        
Stock-Based Compensation Expense [Abstract]        
Stock-based compensation expense $ 409 $ 986 $ 1,170 $ 1,003