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Long-Term Debt (Schedule of carrying value of Notes and Warrants) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Liability component: |  |  |
Principal |  | $ 2,730 |
Equity component: |  |  |
Warrants | [1] | 318 | $ 318
Conversion feature | [1] | 122 | 122
Net carrying amount | [1] | 440 | 440
Secured convertible notes |  |  |
Liability component: |  |  |
Principal |  | 2,730 | 3,000
Less: debt discount and issuance costs, net of amortization |  | (434) | (581)
Net carrying amount |  | 2,296 | 2,419
Equity component: |  |  |
Current portion of liability component included under short-term debt |  | 630 | 360
Long-term portion of liability component included under long-term debt |  | 1,666 | 2,059
Liability component total |  | $ 2,296 | $ 2,419
[1] | Recorded on the condensed consolidated balance sheets as additional paid-in capital.

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