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STOCKHOLDERS' EQUITY - Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Outstanding at ending balance 764,000  
Warrant    
Outstanding at beginning balance 99,000  
Number of Warrants, Granted 0  
Number of Shares, Exercised 0  
Number of Warrants, Forfeited 0  
Outstanding at ending balance 99,000 99,000
Weighted Average Exercise Price, Outstanding at beginning balance $ 2.40  
Weighted Average Exercise Price, Granted 0  
Weighted Average Exercise Price, Exercised 0  
Weighted Average Exercise Price, Forfeited 0  
Weighted Average Exercise Price, Outstanding at ending balance $ 2.40 $ 2.40
Weighted Average Remaining Contractual Life (Years) 2 years 6 months 7 days 2 years 9 months 3 days
Aggregate Intrinsic Value $ 379 $ 660
Employee Stock Option [Member]    
Outstanding at beginning balance 765,000  
Number of Warrants, Granted 0  
Number of Shares, Exercised (1,000)  
Number of Warrants, Forfeited 0  
Outstanding at ending balance 764,000 765,000
Weighted Average Exercise Price, Outstanding at beginning balance $ 1.36  
Weighted Average Exercise Price, Exercised 2.94  
Weighted Average Exercise Price, Outstanding at ending balance $ 1.36 $ 1.36
Weighted Average Remaining Contractual Life (Years) 4 years 5 months 4 days 4 years 8 months 4 days
Weighted Average Remaining Contractual Life, Exercisable (Years) 4 years 2 months 15 days  
Aggregate Intrinsic Value $ 3,780 $ 5,896