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STOCKHOLDERS' EQUITY (Series B Preferred Stock) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 13, 2020 | Aug. 31, 2017 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020 | Feb. 29, 2020 | Dec. 31, 2019 | Apr. 30, 2018 | Aug. 25, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares sold in offering (in shares) | 1,810,000 |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  | $ 0.01 |  | $ 0.01 |  |  |  | $ 0.01 |  |
Preferred stock, shares authorized (in shares) |  |  | 15,000,000 |  | 15,000,000 |  |  |  | 15,000,000 |  |
Preferred stock, shares outstanding (in shares) |  |  | 47 |  | 47 |  |  |  | 47 |  |
Preferred stock, shares issued (in shares) |  |  | 47 |  | 47 |  |  |  | 47 |  |
Offering Warrants |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) |  | 178,666 |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) |  | $ 45.00 |  |  |  |  | $ 0.40 | $ 2.25 |  |  |
Proceeds from issuance of warrants |  |  |  | $ 15,000 |  | $ 15,000 |  |  |  |  |
Preferred Class B |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.01
Number of shares converted (in shares) |  |  | 0 | 0 | 0 | 0 |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  | 6,900 |  | 6,900 |  |  |  | 6,900 |  | 6,900
Preferred stock, shares outstanding (in shares) |  |  | 47 |  | 47 |  |  |  | 47 |  |
Preferred stock, shares issued (in shares) |  |  | 6,900 |  | 6,900 |  |  |  | 6,900 |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  |  |  |  |  |  |  |  | $ 1,000
2018 Note Agreement | Preferred Class B |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) |  |  | $ 0.40 |  | $ 0.40 |  |  |  |  | $ 2.25 |
2018 Note Agreement | Preferred Class B | Deemed Dividend K |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beneficial conversion feature |  |  |  |  | $ 3,300,000 |  |  |  |  |  |

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