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STOCKHOLDERS' EQUITY (Series C Warrants) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2018 | Feb. 28, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Nov. 30, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |
Underlying shares (in shares) |  |  | 909,189 |  | 909,189 |  |
Warrants exercised |  |  |  |  | 20,000 |  |
Series C Warrants [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Underlying shares (in shares) |  |  |  |  |  |  | 130,857
Exercise price (in dollars per share) |  |  |  |  |  |  | $ 24.45
Warrants and Rights Outstanding, Term |  |  |  |  |  |  | 5 years
Percentage of outstanding shares owned threshold prior to exercise of warrants |  |  |  |  |  |  | 4.99%
Percentage of outstanding shares owned threshold after exercise of warrants |  |  |  |  |  |  | 9.99%
2018 Inducement Agreement |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Deemed dividend |  |  |  |  |  | $ 3,848,000 |
2018 Purchase Agreement | Deemed Dividend J |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Deemed dividend |  |  |  |  |  | 58,000 |
2018 Purchase Agreement | Series C Warrants [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Exercise price (in dollars per share) |  | $ 15.60 | $ 11.25 |  | $ 11.25 |  |
2018 Purchase Agreement | Series C Warrants [Member] | Deemed Dividend J |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Deemed dividend |  | $ 58,000 |  |  |  |  |
2018 Note Agreement |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 4.50 |  |  |  |  |  |
2018 Note Agreement | Deemed Dividend O |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Deemed dividend |  |  |  |  |  | $ 45,000 |
2018 Note Agreement | Series C Warrants [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 4.50 |  |  |  |  |  |
Warrants exercised |  |  | 25,037 | 71,333 | 25,037 | 71,333 |
Proceeds from issuance of warrants |  |  | $ 56,000 | $ 321,000 | $ 56,000 | $ 321,000 |
Intrinsic value of warrants exercised in period |  |  |  |  | $ 43,000 | $ 202,000 |
2018 Note Agreement | Series C Warrants [Member] | Deemed Dividend O |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Deemed dividend | $ 45,000 |  |  |  |  |  |

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