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STOCKHOLDERS' EQUITY (Convertible Promissory Note Warrants) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2020
Aug. 31, 2017
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Feb. 29, 2020
Class of Stock [Line Items]              
Deemed dividend     $ 0 $ 0   $ 0  
Convertible Promissory Note Warrants              
Class of Stock [Line Items]              
Exercise price (in dollars per share)   $ 45.00          
Offering Warrants              
Class of Stock [Line Items]              
Exercise price (in dollars per share) $ 0.40 $ 45.00         $ 2.25
Class of warrant or right, term   5 years          
2018 Inducement Agreement              
Class of Stock [Line Items]              
Deemed dividend         $ 3,344    
2018 Purchase Agreement | Deemed Dividend D              
Class of Stock [Line Items]              
Deemed dividend         $ 5    
Maximum | Convertible Promissory Note Warrants              
Class of Stock [Line Items]              
Exercise price (in dollars per share) $ 0.40           $ 2.25
Maximum | Convertible Promissory Note Warrants | Deemed Dividend D              
Class of Stock [Line Items]              
Deemed dividend $ 1