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STOCKHOLDERS' EQUITY (Series B Preferred Stock) (Details) - USD ($) | 1 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Apr. 30, 2018 | Feb. 28, 2018 | Dec. 31, 2017 | Nov. 30, 2017 | Aug. 25, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 0.01 |  | $ 0.01 |  |  |  |  |
Preferred stock, shares authorized (in shares) |  | 15,000,000 |  | 15,000,000 |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  | 47 |  | 47 |  |  |  |  |
Preferred stock, shares issued (in shares) |  | 47 |  | 47 |  |  |  |  |
Offering Warrants |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock rights issued (in shares) | 178,666 |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 45.00 | $ 11.25 |  |  | $ 4.50 | $ 15.60 |  | $ 21.00 |
Proceeds from issuance of warrants |  | $ 15,000 | $ 795,000 |  |  |  |  |  |
Preferred Class B |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.01
Number of shares converted (in shares) |  |  | 2,340 |  |  |  |  |  |
Common stock issued on conversion of preferred shares |  |  | 208,000 |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  | 6,900 |  | 6,900 |  |  |  |  | 6,900
Preferred stock, shares outstanding (in shares) |  | 47 |  | 47 |  |  |  |  |
Preferred stock, shares issued (in shares) |  | 6,900 |  | 6,900 |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  |  |  |  |  |  | $ 1,000
2018 Inducement Agreement | Preferred Class B |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) |  | $ 11.25 |  | $ 15.60 |  |  |  |  |
2018 Inducement Agreement | Preferred Class B | Deemed Dividend B |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Beneficial conversion feature |  |  | $ 40,000,000 |  |  |  |  |  |
2018 Purchase Agreement | Preferred Class B |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) |  | $ 15.60 |  |  |  |  | $ 21.00 |  |
2018 Purchase Agreement | Preferred Class B | Deemed Dividend A |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Beneficial conversion feature |  | $ 1,400,000 |  |  |  |  |  |  |
2018 Note Agreement | Preferred Class B |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) |  | $ 4.50 |  |  | $ 11.25 |  |  |  |
2018 Note Agreement | Preferred Class B | Deemed Dividend K |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Beneficial conversion feature |  | $ 200,000 |  |  |  |  |  |  |

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