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STOCK-BASED COMPENSATION - Schedule of Stock Option Activity (Details) - Stock Option - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Options    
Beginning Balance, Options (in shares) 5,265,370  
Granted, Options (in shares) 1,618,092  
Exercised, Options (in shares) (146,667)  
Forfeited and expired, Options (in shares) (2,338,595)  
Ending Balance, Options (in shares) 4,398,200 5,265,370
Weighted Average Exercise Price    
Beginning Balance, Weighted Average Exercise Price (in USD per share) $ 5.78  
Granted, Weighted Average Exercise Price (in USD per share) 1.93  
Exercised, Weighted Average Exercise Price (in USD per share) 2.37  
Forfeited and expired, Weighted Average Exercise Price (in USD per share) 6.77  
Ending Balance, Weighted Average Exercise Price (in USD per share) $ 3.98 $ 5.78
Aggregate Intrinsic Value (thousands)    
Beginning Balance, Aggregate Intrinsic Value $ 0  
Granted 1,499  
Exercised 36  
Forfeited and expired 325  
Ending Balance, Aggregate Intrinsic Value $ 2,639 $ 0
Weighted Average Remaining Contractual Term 5 years 6 months 1 day 4 years 5 months 1 day
Outstanding options less expected forfeitures, Options (in shares) 4,210,163  
Outstanding options less expected forfeitures, Weighted Average Exercise Price (in USD per share) $ 4.07  
Outstanding options less expected forfeitures, Aggregate Intrinsic Value $ 2,465  
Outstanding options less expected forfeitures, Weighted Average Remaining Contractual Life 5 years 5 months 1 day  
Exercisable, Options (in shares) 2,497,766  
Exercisable, Weighted Average Exercise Price (in USD per share) $ 5.59  
Exercisable, Aggregate Intrinsic Value $ 647  
Exercisable, Weighted Average Remaining Contractual Life 3 years 7 months 1 day