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STOCKHOLDERS' EQUITY (Series B Preferred Stock) (Details) - USD ($)
 1 Months Ended 3 Months Ended
Aug. 31, 2017
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Feb. 28, 2018
Dec. 31, 2017
Nov. 30, 2017
Aug. 25, 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        
Offering Warrants                
Class of Stock [Line Items]                
Stock rights issued (in shares) 178,666              
Exercise price (in dollars per share) $ 45.00 $ 11.25     $ 15.60   $ 21.00  
Proceeds from issuance of warrants   $ 0 $ 225,000          
Preferred Class B                
Class of Stock [Line Items]                
Preferred stock, par value (in dollars per share)               $ 0.01
Number of shares converted (in shares)     2,340          
Common stock issued on conversion of preferred shares     208,000          
Preferred stock, shares authorized (in shares)   6,900           6,900
Preferred stock, shares outstanding (in shares)   47            
Preferred Stock, Liquidation Preference Per Share               $ 1,000
2018 Inducement Agreement | Preferred Class B                
Class of Stock [Line Items]                
Conversion price (in dollars per share)     $ 11.25 $ 15.60        
2018 Inducement Agreement | Preferred Class B | Deemed Dividend B                
Class of Stock [Line Items]                
Beneficial conversion feature     $ 40,000,000          
2018 Purchase Agreement | Preferred Class B                
Class of Stock [Line Items]                
Conversion price (in dollars per share)   $ 15.60       $ 21.00    
2018 Purchase Agreement | Preferred Class B | Deemed Dividend A                
Class of Stock [Line Items]                
Beneficial conversion feature   $ 1,400,000