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STOCKHOLDERS’ EQUITY (DEFICIT) - Reserve Shares of Common Stock (Details) - shares
Sep. 30, 2020
Dec. 31, 2019
Class of Stock [Line Items]    
Capital shares reserved for future issuance (in shares) 67,443,081 25,141,814
Outstanding stock options    
Class of Stock [Line Items]    
Capital shares reserved for future issuance (in shares) 17,567,580 8,781,615
Warrants to purchase common stock    
Class of Stock [Line Items]    
Capital shares reserved for future issuance (in shares) 39,546,516 14,040,452
Shares issuable upon conversion of convertible debt    
Class of Stock [Line Items]    
Capital shares reserved for future issuance (in shares) 475,067 1,217,008
For possible future issuance under the Omnibus Plan    
Class of Stock [Line Items]    
Capital shares reserved for future issuance (in shares) 9,853,918.35 1,102,739