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SHARE-BASED COMPENSATION - Summary of Restricted Stock Units (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Stock Options    
Weighted Average Grant-Date Fair Value Per Share    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0  
Forfeiture rate (as percent) 25.00% 25.00%
RSU    
Summary of the restricted stock unit activity    
Unvested at the beginning of the period (in shares) 377,810  
Granted (in shares) 411,910  
Vested (in shares) (198,762)  
Forfeited (in shares) (98,782)  
Unvested at the end of the period (in shares) 492,176 377,810
Weighted Average Grant-Date Fair Value Per Share    
Unvested at the beginning of the period (in dollars per share) $ 4.87  
Granted (in dollars per share) 2.84  
Vested (in dollars per share) 4.73  
Forfeited (in dollars per share) 3.22  
Unvested at the end of the period (in dollars per share) $ 3.56 $ 4.87