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CONVERTIBLE NOTES (2017 New Bridge Notes II) (Details) - USD ($) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 29, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Aug. 31, 2017 | Jun. 30, 2017 | Apr. 28, 2017
Short-term Debt [Line Items] |  |  |  |  |  |
Underlying shares (in shares) |  | 13,763,608 |  |  |  |
Warrants, fair value | $ 211,000 |  |  |  |  |
Merger advisory fees |  |  | $ 2,676,000 |  |  |
Proceeds from equity financing |  | $ 7,000,000 |  |  |  |
Total debt |  | 516,000 | 3,416,000 |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs |  | $ 62,000 |  |  |  |
Upon Execution |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Underlying shares (in shares) |  | 22,857 |  |  |  |
Performance Based |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Underlying shares (in shares) |  | 68,572 |  |  |  |
Side Warrants [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Underlying shares (in shares) |  | 91,429 |  |  |  |
Exercise price (in dollars per share) |  | $ 7.00 |  |  |  |
Class of warrant or right, term |  | 5 years |  |  |  |
Merger advisory fees |  |  | $ 487,000 |  |  |
Common Stock |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Underlying shares (in shares) | 45,600 |  |  |  |  |
Exercise price (in dollars per share) | $ 7.50 |  |  |  |  |
Common Stock | Side Warrants [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Underlying shares (in shares) |  | 0 |  |  |  |
Bridge Loan |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Premium rate changed upon settlement of debt |  |  |  |  |  | 20.00%
Total debt |  |  |  |  |  | $ 2,436,551
Bridge Loan | Common Stock |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Conversion price (in dollars per share) |  |  |  |  |  | $ 2.50
Underlying shares (in shares) |  |  |  |  | 45,600 |
Exercise price (in dollars per share) |  |  | $ 1.40 | $ 3.00 | $ 7.50 |
Bridge Loan | 2017 New Bridge Notes II |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Sale of debt | $ 800,000 |  |  |  |  |
Proceeds from sale of debt instrument | $ 721,000 |  |  |  |  |
Interest rate (as a percent) | 8.00% |  |  |  |  |
Conversion price (in dollars per share) | $ 3.736329 |  |  |  |  |
Premium rate changed upon settlement of debt | 20.00% |  |  |  |  |
Premium on debt settlement | $ 160,000 |  |  |  |  |
Discount on debt | $ 656,000 |  |  |  |  |

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