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CONVERTIBLE NOTES (Bridge Note debt discounts and debt premiums) (Details) - Convertible Debt [Member] - Convertible Bridge Loan - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Debt discounts |  |  |  |
Beginning balance |  |  | $ (1,111) |
Additions |  | $ (1,337) | (2,086) | $ (3,161)
Deductions: Amortization/accretion | $ 41 | 59 | 154 | 68
Deductions: Write-off related to note conversions | 63 |  | 989 |
Ending balance | $ (2,054) | $ (3,093) | (2,054) | $ (3,093)
Debt premiums |  |  |  |
Beginning balance |  |  | 647 |
Deductions: Amortization/accretion |  |  | (167) |
Deductions: Write-off related to note conversions |  |  | $ (480) |

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