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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Debt discounts |  |  |  |
Beginning balance | $ (1,053) |  | $ (1,111) |
Additions | (2,086) | $ (1,824) | (2,086) | $ (1,824)
Deductions: Amortization/accretion | 55 | 9 | 113 | 9
Deductions: Write-off related to note conversions | 926 |  | 926 |
Ending balance | (2,158) | $ (1,815) | (2,158) | $ (1,815)
Debt premiums |  |  |  |
Beginning balance |  |  | 647 |
Deductions: Amortization/accretion | (7) |  | (167) |
Deductions: Write-off related to note conversions | (84) |  | (480) |
Ending balance | $ 91 |  | $ 91 |

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