Long-Term Debt (Schedule of carrying value of Notes and Warrants) (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Liability component:
Principal		$ 2,640
Equity component:
Warrants	[1]	318	$ 318
Conversion feature	[1]	122	122
Net carrying amount	[1]	440	440
Secured convertible notes
Liability component:
Principal		2,640	3,000
Less: debt discount and issuance costs, net of amortization		(385)	(581)
Net carrying amount		2,255	2,419
Equity component:
Current portion of liability component included under short-term debt		720	360
Long-term portion of liability component included under long-term debt		1,920	2,059
Liability component total		$ 2,640	$ 2,419

[1] Recorded on the consolidated balance sheets as additional paid-in capital.