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STOCK-BASED COMPENSATION - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity-classified and liability-classified stock-based compensation       $ 1,414,000 $ 1,026,000
2018 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity-classified and liability-classified stock-based compensation   $ 821,000 $ 580,000 1,379,000 918,000
Liability-classified stock-based compensation converted to equity-classified $ 313,000        
Liability-Classified Stock | 2018 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity-classified and liability-classified stock-based compensation   $ 35,000 $ 108,000 $ 35,000 $ 108,000