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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
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