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STOCK-BASED COMPENSATION PLANS - Summary of stock option activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Summary of stock option activity under the option Plan    
Outstanding and Exercisable at ending balance 824  
Number of Shares, Exercisable 595  
Employee Stock Option [Member]    
Summary of stock option activity under the option Plan    
Outstanding at beginning balance 1,006  
Number of Shares, Granted 0  
Number of Warrants, Exercised (174)  
Number of Shares, Forfeited (8)  
Outstanding and Exercisable at ending balance 824 1,006
Number of Shares, Exercisable 595  
Weighted Average Exercise Price, Outstanding at beginning balance $ 3.04  
Weighted Average Exercise Price, Granted 0  
Weighted Average Exercise Price, Exercised 7.65  
Weighted Average Exercise Price, Forfeited 3.12  
Weighted Average Exercise Price, Outstanding at ending balance 2.07 $ 3.04
Weighted Average Exercise Price, Exercisable at ending balance $ 1.73  
Weighted Average Remaining Contractual Life, Outstanding 5 years 9 months 14 days 6 years 5 months 19 days
Weighted Average Remaining Contractual Life, Exercisable (Years) 5 years 2 months 23 days  
Aggregate Intrinsic Value, Outstanding $ 10,873 $ 10,483
Aggregate Intrinsic Value, Exercisable $ 8,061