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STOCK-BASED COMPENSATION - Restricted stock units, Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2021
Mar. 31, 2021
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense       $ 7,616,000 $ 4,138,000
Weighted average volatility factor (as a percent)       100.60% 107.28%
Risk-free interest rate (as a percent)       0.34% 0.19%
Performance period       3 years 3 months 3 years 1 month 28 days
Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted 100,000 100,000 260,000    
Performance-based          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted   50,000 105,000 55,000  
Stock-based compensation expense       $ 471,000 $ 314,000
Market-based          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted   50,000 155,000 50,000  
Stock-based compensation expense       $ 1,141,000 $ 1,506,000
Weighted average volatility factor (as a percent)   116.95% 136.52%    
Risk-free interest rate (as a percent)   0.79% 0.26%    
Performance period   5 years 5 years