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STOCK-BASED COMPENSATION - Stock Appreciation Rights (Details) - USD ($)
12 Months Ended
Mar. 09, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
PIPE transaction issuance costs $ 4,000,000      
Stock Appreciation Rights (SARs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense (benefit)   $ (913,000) $ (20,000) $ (48,000)
Stock appreciation rights   300,000 320,000  
Vesting period   3 years    
Exercise period   10 years    
PIPE transaction issuance costs   $ 0 $ 0 $ 0
Stock Appreciation Rights (SARs) | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Holding period   1 year