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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, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Nonvested awards, compensation not yet recognized $ 712  
Weighted average service period 2 years 3 months  
Number of Restricted Stock Units    
Unvested restricted stock units at January 1 (in shares) 577,725 1,088,933
Granted (in shares) 251,048 45,329
Shares earned above target (in shares) 7,223 244,855
Vested (in shares) (277,937) (498,919)
Forfeited (in shares) (60,702) (7,515)
Unvested restricted stock units at March 31 (in shares) 497,357 872,683
Weighted Average Grant-Date Fair Value    
Unvested restricted stock units at January 1 (usd per share) $ 1.57 $ 1.16
Granted (usd per share) 1.53 2.14
Shares earned above target (usd per share) 1.70 1.00
Vested (usd per share) 1.62 1.28
Forfeited (usd per share) 1.70 1.00
Unvested restricted stock units at March 31 (usd per share) $ 1.54 $ 1.10