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STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS - Schedule of Stock Option Activity (Details) - Stock Option - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Options    
Beginning Balance, Options (in shares) 4,398,200  
Granted, Options (in shares) 1,047,642  
Exercised, Options (in shares) (427,977)  
Forfeited and expired, Options (in shares) (1,320,140)  
Ending Balance, Options (in shares) 3,697,725 4,398,200
Weighted Average Exercise Price    
Beginning Balance, Weighted Average Exercise Price (in USD per share) $ 3.98  
Granted, Weighted Average Exercise Price (in USD per share) 2.61  
Exercised, Weighted Average Exercise Price (in USD per share) 2.14  
Forfeited and expired, Weighted Average Exercise Price (in USD per share) 4.78  
Ending Balance, Weighted Average Exercise Price (in USD per share) $ 3.52 $ 3.98
Aggregate Intrinsic Value (thousands)    
Beginning Balance, Aggregate Intrinsic Value $ 2,639  
Granted 990  
Exercised 382  
Forfeited and expired 904  
Ending Balance, Aggregate Intrinsic Value $ 3,974 $ 2,639
Weighted Average Remaining Contractual Term 5 years 10 months 25 days 5 years 6 months
Exercisable, Options (in shares) 2,132,090  
Exercisable, Weighted Average Exercise Price (in USD per share) $ 4.46  
Exercisable, Aggregate Intrinsic Value $ 1,875  
Exercisable, Weighted Average Remaining Contractual Life 4 years 1 month 6 days