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STOCKHOLDERS' EQUITY (Note Conversion Warrants) (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 12, 2018 | Nov. 30, 2018 | Apr. 30, 2018 | Jul. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 28, 2018 | Dec. 31, 2017 | Aug. 31, 2017 | Jun. 30, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion of debt into stock | $ 1,900,000 |  |  |  | $ 7,553,000 | $ 2,356,000 |  |  |  |
Conversion of convertible notes into common stock (in shares) | 120,983 |  |  |  |  |  |  |  |  |
Underlying shares (in shares) |  |  |  |  | 909,189 |  |  |  |  |
Deemed dividend |  |  |  |  | $ 0 | 4,222,000 |  |  |  |
Series A Conversion Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  | $ 7.50 |  |  |  |  |
Underlying shares (in shares) |  |  |  |  | 9,101 |  |  |  |  |
Warrants, fair value |  |  |  |  | $ 10,000 |  |  |  |  |
Note Conversion Warrants |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Class of warrant or right, term |  |  |  |  | 5 years |  |  |  |  |
2018 Inducement Agreement | Deemed Dividend K |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Deemed dividend |  |  |  |  |  | 5,000 |  |  |  |
2018 Inducement Agreement | Deemed Dividend F |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Deemed dividend |  |  |  |  |  | 1,154,000 |  |  |  |
2018 Inducement Agreement | Note Conversion Warrants | Deemed Dividend K |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Deemed dividend |  |  |  |  | $ 5,000 |  |  |  |  |
2018 Purchase Agreement | Deemed Dividend J |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Deemed dividend |  |  |  |  |  | 8,000 |  |  |  |
2018 Purchase Agreement | Deemed Dividend G |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Deemed dividend |  |  |  |  |  | 62,000 |  |  |  |
2018 Purchase Agreement | Note Conversion Warrants | Deemed Dividend J |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Deemed dividend |  |  |  |  | 8,000 |  |  |  |  |
2018 Note Agreement |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) |  | $ 2.25 | $ 4.50 |  |  |  |  |  |  |
2018 Note Agreement | Deemed Dividend L |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Deemed dividend |  |  |  |  |  | 10,000 |  |  |  |
2018 Note Agreement | Note Conversion Warrants |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) |  | $ 2.25 | $ 4.50 |  |  |  |  |  |  |
2018 Note Agreement | Note Conversion Warrants | Deemed Dividend L |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Deemed dividend |  |  | $ 10,000 |  |  |  |  |  |  |
2018 Note Agreement | Note Conversion Warrants | Deemed Dividend M |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Deemed dividend |  | $ 4,000 |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion of debt into stock |  |  |  |  | $ 7,600,000 | $ 2,400,000 |  |  |  |
Conversion of convertible notes into common stock (in shares) |  |  |  |  | 310,200 | 252,486 |  |  |  |
Common Stock | Note Conversion Warrants |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion of convertible notes into common stock (in shares) |  |  |  | 23,999 |  |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  |  |  |  | $ 21.00 | $ 45.00 |
Common Stock | 2018 Inducement Agreement | Note Conversion Warrants |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  | $ 11.25 |  |  |  |  |
Common Stock | 2018 Purchase Agreement | Note Conversion Warrants |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  |  |  | $ 15.60 |  |  |
Bridge Loan | Common Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 112.50

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