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Long-Term Debt (Schedule of carrying value of Notes and Warrants) (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Equity component:
Warrants	[1]	$ 318	$ 318
Conversion feature	[1]	122	122
Net carrying amount	[1]	440	440
Secured convertible notes
Liability component:
Principal		2,910	3,000
Less: debt discount and issuance costs, net of amortization		(532)	(581)
Net carrying amount		2,378	2,419
Equity component:
Current portion of liability component included under short-term debt		450	360
Long-term portion of liability component included under long-term debt		1,928	2,059
Liability component total		$ 2,378	$ 2,419
[1] Recorded on the condensed consolidated balance sheets as additional paid-in capital.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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