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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, 2020 | Sep. 30, 2019
Debt discounts |  |  |
Beginning balance | $ (2,158) | $ (1,796) | $ (1,111)
Additions |  |  | (2,086)
Deductions: Amortization/accretion | 41 | 703 | 154
Deductions: Write-off related to note conversions | 63 | 138 | 989
Deductions: Write-off related to note extinguishment |  | 955 |
Ending balance | $ (2,054) |  | (2,054)
Debt premiums |  |  |
Beginning balance |  |  | 647
Additions: |  | 793 |
Deductions: Amortization/accretion |  | (385) | (167)
Deductions: Write-off related to note conversions |  | $ (408) | $ (480)

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