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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Debt discounts |  |  |  |
Beginning balance |  | $ (1,053) | $ (1,796) | $ (1,111)
Additions |  | (2,086) |  | (2,086)
Deductions: Amortization/accretion |  | 55 | 703 | 113
Deductions: Write-off related to note conversions |  | 926 | 138 | 926
Deductions: Write-off related to note extinguishment |  |  | 955 |
Ending balance |  | (2,158) |  | (2,158)
Debt premiums |  |  |  |
Beginning balance | $ 679 | 91 |  | 647
Additions: |  |  | 793 |
Deductions: Amortization/accretion | (346) | (7) | (385) | (167)
Deductions: Write-off related to note conversions | $ (333) | $ (84) | $ (408) | $ (480)

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