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STOCK-BASED COMPENSATION PLANS - Summary of stock option activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Summary of stock option activity under the option Plan    
Number of Shares, Granted   14,000
Outstanding at ending balance 765,000  
Exercisable Number of Options 670,000  
Weighted Average Remaining Contractual Life, Exercisable (Years) 4 years 3 months 29 days  
Employee Stock Option [Member]    
Summary of stock option activity under the option Plan    
Outstanding at beginning balance 1,107,000 2,041,000
Number of Shares, Granted   15,000
Number of Shares, Exercised (116,000) (684,000)
Number of Shares, Forfeited (226,000) (265,000)
Outstanding at ending balance 765,000 1,107,000
Exercisable Number of Options 670,000  
Weighted Average Exercise Price, Outstanding at beginning balance $ 2.76 $ 2.25
Weighted Average Exercise Price, Granted   9.23
Weighted Average Exercise Price, Exercised 4.87 0.82
Weighted Average Exercise Price, Forfeited 6.45 4.25
Weighted Average Exercise Price, Outstanding at ending balance 1.36 $ 2.76
Weighted Average Exercise Price, Exercisable at ending balance $ 0.99  
Weighted Average Remaining Contractual Life, Outstanding 4 years 8 months 4 days 6 years 5 months 19 days
Weighted Average Remaining Contractual Life, Exercisable (Years) 4 years 3 months 29 days  
Aggregate Intrinsic Value, Outstanding $ 5,896 $ 10,483
Aggregate Intrinsic Value, Exercisable $ 5,412