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STOCKHOLDERS' EQUITY (New Bridge Warrants) (Details) - USD ($) | Dec. 31, 2019 | Aug. 31, 2017 | Jun. 30, 2017
--- | --- | --- | ---
Class of Stock [Line Items] |  |  |
Underlying shares (in shares) | 909,189 |  |
2017 Bridge Notes | Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Underlying shares (in shares) | 500 |  |
Exercise price (in dollars per share) | $ 7.50 | $ 41.25 |
Warrants, fair value | $ 1,000 |  |
Bridge Loan | Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Exercise price (in dollars per share) |  |  | $ 112.50

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