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STOCKHOLDERS' EQUITY - Additional Information (Details) - USD ($) |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 28, 2020 | Dec. 23, 2020 | Jun. 05, 2020 | May 20, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 1,982,000 |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  | 17,456,266 |  |
Share Price |  |  |  | $ 2.50 |  |  |
Issuance of common stock, warrants and preferred stock, net of issuance costs |  |  |  | $ 10,000,000 | $ 59,719,256 | $ 9,024,569 |
Proceeds from issuance of common stock and warrants, net of underwriting issuance costs |  |  |  | 6,000,000 |  |  |
Proceeds from warrants |  |  |  | 4,000,000 |  |  |
Net proceeds from stockholders' equity |  |  |  | 9,000,000 |  |  |
Number of Shares Issuable Upon Exercise of Outstanding Warrants (in shares) |  |  |  |  | 17,456,266 |  |
Common Stock, Shares Authorized |  |  |  |  | 80,000,000 | 80,000,000 |
Common Stock, Par or Stated Value Per Share |  |  |  |  | $ 0.00001 | $ 0.00001 |
Stockholders' Equity Attributable to Parent |  |  |  |  | $ 54,794,529 | $ 9,059,409 | $ 13,260,961
Stock Issued During Period, Value, New Issues |  |  |  | $ 10,000,000 | 59,719,256 | $ 9,024,569 |
Stock Issued During Period On Exercise Of Warrants, Value |  |  |  |  | 642,495 |  |
Proceeds from Warrant Exercises |  |  |  |  | $ 642,495 |  |
Common Stock [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  | 32,749,764 | 4,000,000 |
Issuance of common stock, warrants and preferred stock, net of issuance costs |  |  |  |  | $ 327 | $ 40 |
Stockholders' Equity Attributable to Parent |  |  |  |  | 454 | 94 | $ 47
Stock Issued During Period, Value, New Issues |  |  |  |  | 327 | $ 40 |
Stock Issued During Period On Exercise Of Warrants, Value |  |  |  |  | $ 33 |  |
Series C Preferred Stock [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  | 215 | 215 |
Series D Preferred Stock [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 1,518.5180 |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  | 1,519 | 0 |
Series F warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  |  | $ 2.40 |  |  |
Series G warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Share Price |  |  |  | 2.50 |  |  |
June 2020 Pre Funded Warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 14,601,628 |  |  |  |
Number of warrants exercised |  |  |  |  | 2,789,700 |  |
Number of share of common stock per warrant |  |  | 1 |  |  |  |
Exercise price of warrants (in dollars per share) |  |  | $ 0.00001 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 2,789,700 |  |  |  |
Number of Shares Issuable Upon Exercise of Outstanding Warrants (in shares) |  |  | 2,789,700 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right |  |  | 1 |  |  |  |
June 2020 Series H Warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Number of warrants exercised |  |  |  |  | 482,375 |  |
Exercise price of warrants (in dollars per share) |  |  | $ 1.2075 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 8,695,664 |  |  |  |
Issuance of common stock, warrants and preferred stock, net of issuance costs |  |  | $ 20,000,000 |  |  |  |
Proceeds from issuance of common stock and warrants, net of underwriting issuance costs |  |  | 12,100,000 |  |  |  |
Proceeds from warrants |  |  | 7,900,000 |  |  |  |
Net proceeds from stockholders' equity |  |  | $ 18,300,000 |  |  |  |
Number of Shares Issuable Upon Exercise of Outstanding Warrants (in shares) |  |  | 8,695,664 |  |  |  |
Stockholders' Equity Attributable to Parent |  |  | $ 20,000,000 |  |  |  |
Public Offering Price Of Share And Warrants |  |  | $ 1.15 |  |  |  |
Public Offering Price Of Warrants |  |  | $ 1.1499 |  |  |  |
Warrants and Rights Outstanding, Term |  |  | 5 years |  |  |  |
Stock Issued During Period, Value, New Issues |  |  | $ 20,000,000 |  |  |  |
Private Placement [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  |  | $ 2.40 |  |  |
Warrants Expiration Period |  |  |  | 5 years |  |  |
Private Placement [Member] | Series D Preferred Stock [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 10,000 |  |  |  |  |
Convertible Preferred Stock Conversion Price |  | $ 1.35 |  |  |  |  |
Convertible preferred stock, Value of shares issuable upon conversion |  | $ 13,500 |  |  |  |  |
Private Placement [Member] | Series F warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Number of warrants exercised |  |  |  |  | 25,000 |  |
Private Placement [Member] | December 2020 Public Offering [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 45,000,000 | 18,148,136 |  |  |  |  |
Proceeds from issuance of preferred stock | $ 20,500,000 |  |  |  |  |  |
Proceeds from issuance of common stock and warrants, net of underwriting issuance costs | $ 24,500,000 |  |  |  |  |  |
Net proceeds from stockholders' equity |  |  |  |  | $ 41,400,000 |  |
Common Stock, Par or Stated Value Per Share |  | $ 0.00001 |  |  |  |  |
Public offering price of share |  | $ 1.35 |  |  |  |  |
Private Placement [Member] | Series F warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Warrants issued |  |  |  | 1,982,000 |  |  |
Private Placement [Member] | Series G warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 2,018,000 |  |  |
Warrants issued |  |  |  | 2,018,000 |  |  |

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