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STOCK-BASED COMPENSATION - Board of Directors Compensation - Additional Information (Details) - Director [Member] - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Restricted stock awards and units vesting terms 1 year      
Fair value of shares issued $ 297,000 $ 299,000 $ 591,000 $ 596,000
Shares issued (in shares) 2,706 3,228 2,706 3,228