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STOCKHOLDERS' EQUITY - Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Outstanding and Exercisable at ending balance 1,006,000    
Weighted Average Remaining Contractual Life, Exercisable (Years) 5 years 4 months 6 days    
Warrant      
Outstanding at beginning balance 100,000 150,000  
Number of Warrants, Exercised   (40,000)  
Number of Warrants, Forfeited   (10,000)  
Outstanding and Exercisable at ending balance 100,000 100,000 150,000
Weighted Average Exercise Price, Outstanding at beginning balance $ 2.63 $ 2.42  
Weighted Average Exercise Price, Exercised   2.00  
Weighted Average Exercise Price, Forfeited   2.00  
Weighted Average Exercise Price, Outstanding at ending balance $ 2.63 $ 2.63 $ 2.42
Weighted Average Remaining Contractual Life (Years) 3 years 9 months 3 days 4 years 9 months 7 days 5 years 9 months 7 days
Weighted Average Remaining Contractual Life, Exercisable (Years)   4 years 9 months 7 days 5 years 9 months 7 days
Aggregate Intrinsic Value $ 1,084 $ 525 $ 79
Aggregate Intrinsic Value, Exercisable   $ 525 $ 79