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STOCKHOLDERS' EQUITY - Warrants (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Outstanding and Exercisable at June 30, 2020 1,153    
Weighted Average Exercise Price, Granted $ 10.15 $ 4.53  
Warrant      
Outstanding at December 31, 2019 100    
Outstanding and Exercisable at June 30, 2020 100   100
Weighted Average Exercise Price, Outstanding at December 31, 2019 $ 2.63    
Weighted Average Exercise Price, Outstanding at June 30, 2020 $ 2.63   $ 2.63
Weighted Average Remaining Contractual Life (Years) 4 years 3 months 7 days   4 years 9 months 7 days
Aggregate Intrinsic Value $ 845   $ 525