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STOCK-BASED COMPENSATION Restricted stock units (Details) - Restricted stock units - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total compensation cost not yet recognized $ 103  
Weighted average service period 1 year 10 months 25 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Non-vested restricted stock (units), number of shares of restricted stock (unit), At the Beginning of the Year (shares) 1,088,933 480,000
Granted, Number of share of restricted stock (shares) 45,329 1,077,000
Shares earned above target, Number of share of restricted stock (shares) 244,855 0
Vested, number of share of restricted stock (shares) (498,919) (135,727)
Forfeited, number of share of restricted stock (shares) (7,515) (332,340)
Non-vested restricted stock (units), number of shares of restricted stock (unit), At the End of the Period (shares) 872,683 1,088,933
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), weighted average grant date fair value, At the Beginning of the Year (usd per share) $ 1.16 $ 2.79
Granted, weighted average grant date fair value (usd per share) 2.14 1.00
Shares earned above target, weighted average grant date fair value (usd per share) 1.00 0.00
Vested, weighted average grant date fair value (usd per share) 1.28 1.64
Forfeited, weighted average grant date fair value (usd per share) 1.00 2.79
Non-vested restricted stock (units), weighted average grant date fair value, At the End of the Period (usd per share) $ 1.10 $ 1.16
Non-Employee Director    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted, Number of share of restricted stock (shares) 45,329