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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
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Jun. 30, 2020 | Jun. 30, 2020
Debt discounts |  |
Beginning balance |  | $ (1,796)
Deductions: Amortization/accretion |  | 703
Deductions: Write-off related to note conversions |  | 138
Deductions: Write-off related to note extinguishment |  | 955
Debt premiums |  |
Beginning balance | $ 679 |
Additions: |  | 793
Deductions: Amortization/accretion | (346) | (385)
Deductions: Write-off related to note conversions | $ (333) | $ (408)

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