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CONVERTIBLE NOTES (Bridge Note debt discounts and debt premiums) (Details) - Convertible Debt [Member] - Convertible Bridge Loan [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Debt discounts |  |
Beginning balance | $ (1,796) | $ (1,111)
Additions |  | (2,088)
Deductions: Amortization/accretion | 703 | 273
Deductions: Write-off related to note conversions | 138 | 1,130
Deductions: Write-off related to note extinguishment | 955 |
Ending balance |  | (1,796)
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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