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STOCKHOLDERS' EQUITY (Deemed Dividends) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Class of Stock [Line Items]    
Amount Recorded $ 0 $ 3,344
2018 Purchase Agreement | Deemed Dividend A    
Class of Stock [Line Items]    
Amount Recorded   3,333
2018 Purchase Agreement | Deemed Dividend B    
Class of Stock [Line Items]    
Amount Recorded   6
2018 Purchase Agreement | Deemed Dividend C    
Class of Stock [Line Items]    
Amount Recorded   $ 5