Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY (Details)

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STOCKHOLDERS' EQUITY (Details)
Mar. 31, 2021
$ / shares
shares
Class of Warrant or Right [Line Items]  
Number of Shares Issuable Upon Exercise of Outstanding Warrants (in shares) 16,450,946
June 2020 Series H Warrants [Member]  
Class of Warrant or Right [Line Items]  
Number of Shares Issuable Upon Exercise of Outstanding Warrants (in shares) 7,207,969
Exercise price of warrants (in dollars per share) | $ / shares $ 1.2075
May 2019 Series F Warrants [Member]  
Class of Warrant or Right [Line Items]  
Number of Shares Issuable Upon Exercise of Outstanding Warrants (in shares) 1,957,000
Exercise price of warrants (in dollars per share) | $ / shares $ 2.40
May 2019 Series G Warrants [Member]  
Class of Warrant or Right [Line Items]  
Number of Shares Issuable Upon Exercise of Outstanding Warrants (in shares) 2,018,000
Exercise price of warrants (in dollars per share) | $ / shares $ 2.40
July 2018 Series E Warrants [Member]  
Class of Warrant or Right [Line Items]  
Number of Shares Issuable Upon Exercise of Outstanding Warrants (in shares) 4,140,000
Exercise price of warrants (in dollars per share) | $ / shares $ 4.00
October 2017 Series D Warrants [Member]  
Class of Warrant or Right [Line Items]  
Number of Shares Issuable Upon Exercise of Outstanding Warrants (in shares) 310,856
Exercise price of warrants (in dollars per share) | $ / shares $ 17.80
November 2016 Public Offering Series C [Member]  
Class of Warrant or Right [Line Items]  
Number of Shares Issuable Upon Exercise of Outstanding Warrants (in shares) 415,785
Exercise price of warrants (in dollars per share) | $ / shares $ 15.00
April 2016 Underwritten Registered Series A [Member]  
Class of Warrant or Right [Line Items]  
Number of Shares Issuable Upon Exercise of Outstanding Warrants (in shares) 362,694
Exercise price of warrants (in dollars per share) | $ / shares $ 30.40
October 2015 Incremental Series A [Member]  
Class of Warrant or Right [Line Items]  
Number of Shares Issuable Upon Exercise of Outstanding Warrants (in shares) 30,006
Exercise price of warrants (in dollars per share) | $ / shares $ 21.30
October 2015 Private Placement Series A [Member]  
Class of Warrant or Right [Line Items]  
Number of Shares Issuable Upon Exercise of Outstanding Warrants (in shares) 8,636
Exercise price of warrants (in dollars per share) | $ / shares $ 21.30