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STOCKHOLDERS' EQUITY (Convertible Promissory Note Warrants) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Feb. 28, 2018
Aug. 31, 2017
Convertible Promissory Note Warrants        
Class of Stock [Line Items]        
Exercise price (in dollars per share) $ 21.00     $ 45.00
2018 Inducement Agreement        
Class of Stock [Line Items]        
Deemed dividend   $ 3,514,000    
2018 Inducement Agreement | Convertible Promissory Note Warrants        
Class of Stock [Line Items]        
Exercise price (in dollars per share) $ 11.25      
2018 Purchase Agreement | Convertible Promissory Note Warrants        
Class of Stock [Line Items]        
Exercise price (in dollars per share)     $ 15.60  
Maximum | 2018 Inducement Agreement | Convertible Promissory Note Warrants        
Class of Stock [Line Items]        
Deemed dividend $ 1,000      
Maximum | 2018 Purchase Agreement | Convertible Promissory Note Warrants        
Class of Stock [Line Items]        
Deemed dividend $ 1,000