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STOCK-BASED COMPENSATION, RSUs (Details) - RSU [Member] - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Stock-based Compensation [Abstract]        
Number of stock units awards granted (in shares) 116,350 0 221,640 0
Weighted average grant date fair value (in dollars per share) $ 10.07   $ 14.60  
Stock units vested (in shares) 0 0 0 0