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STOCK-BASED COMPENSATION Restricted stock units (Details) - Restricted stock units - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Non-vested restricted stock (units) at January 1, weighted average grant date fair value $ 1.16 $ 2.79
Granted, weighted average grant date fair value 1.73 1.09
Vested, weighted average grant date fair value 1.25 1.47
Forfeitures, Weighted Average Grant Date Fair Value 1.00 2.79
Non-vested restricted stock (units) at December 31, weighted average grant date fair value $ 1.57 $ 1.16
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Shares Earned Above Target 244,855 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares Earned Above Target, Weighted Average Grant Date Fair Value $ 1.00 $ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Unvested restricted stock (units) at January 1, number of shares of restricted stock (unit) 1,088,933 480,000
Granted, number of share of restricted stock (units) 717,596 1,404,128
Vested, number of share of restricted stock (units) (1,465,640) (462,855)
Forfeited, number of share of restricted stock (units) (8,019) (332,340)
Unvested restricted stock (units) at December 31, number of shares of restricted stock (unit) 577,725 1,088,933
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 2,792 $ 595