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STOCKHOLDERS' EQUITY (Series C Preferred Stock) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Nov. 06, 2017
Class of Stock [Line Items]        
Preferred stock, par value (in dollars per share) $ 0.01   $ 0.01  
Preferred stock, shares authorized (in shares) 15,000,000   15,000,000  
Preferred stock, shares outstanding (in shares) 47   47  
Preferred stock, shares issued (in shares) 47   47  
Series C Preferred Stock [Member]        
Class of Stock [Line Items]        
Preferred stock, par value (in dollars per share)       $ 0.01
Number of shares converted (in shares)   2,548    
Preferred stock, shares authorized (in shares) 2,748     2,748
Preferred stock, shares outstanding (in shares) 0      
Preferred stock, shares issued (in shares) 0      
Preferred Stock, Liquidation Preference Per Share       $ 1,000
Common stock issued on conversion of preferred shares   223,022 223,022  
Placement Agreement | Series C Preferred Stock [Member]        
Class of Stock [Line Items]        
Conversion price (in dollars per share) $ 21.00      
2018 Purchase Agreement | Series C Preferred Stock [Member]        
Class of Stock [Line Items]        
Conversion price (in dollars per share) $ 15.60      
Beneficial conversion feature $ 0.8