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CONVERTIBLE NOTES (Bridge Note debt discounts and debt premiums) (Details) - Convertible Debt [Member] - Convertible Bridge Loan - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Debt discounts |  |
Beginning balance | $ (1,111) |
Additions | (2,088) | (4,275)
Deductions: Amortization/accretion | 273 | 118
Deductions: Write-off related to note conversions | 1,130 |
Deductions: Write-off related to note extinguishment |  | 3,046
Ending balance | (1,796) | (1,111)
Debt premiums |  |
Beginning balance | 647 |
Additions: |  | 879
Deductions: Amortization/accretion | (167) | (170)
Deductions: Write-off related to note conversions | (480) | (62)
Ending balance |  | $ 647

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