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STOCKHOLDERS' EQUITY (Details) | Dec. 31, 2020 $ / shares shares
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Class of Warrant or Right [Line Items] |
Number of Shares Issuable Upon Exercise of Outstanding Warrants (in shares) | 17,456,266
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 17,456,266
June 2020 Series H Warrants [Member] |
Class of Warrant or Right [Line Items] |
Number of Shares Issuable Upon Exercise of Outstanding Warrants (in shares) | 8,213,289
Exercise price of warrants (in dollars per share) | $ / shares | $ 1.21
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 8,213,289
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
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 1,957,000
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
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 2,018,000
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
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 4,140,000
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
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 310,856
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
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 415,785
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
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 362,694
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
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 30,006
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
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 8,636

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