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STOCKHOLDERS' EQUITY (Convertible Promissory Note Warrants) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Feb. 29, 2020
Aug. 31, 2017
Class of Stock [Line Items]        
Deemed dividend $ 0 $ 3,344    
Convertible Promissory Note Warrants        
Class of Stock [Line Items]        
Exercise price (in dollars per share)   $ 0.40 $ 2.25 $ 45.00
Maximum | Convertible Promissory Note Warrants | Deemed Dividend D        
Class of Stock [Line Items]        
Deemed dividend   $ 1