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Long-Term Debt (Schedule of carrying value of Notes and Warrants) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Equity component: |  |  |
Warrants | [1] | $ 318 | $ 318
Conversion feature | [1] | 122 | 122
Net carrying amount | [1] | 440 | 440
Secured convertible notes |  |  |
Liability component: |  |  |
Principal |  | 3,000 | 3,000
Less: debt discount and issuance costs, net of amortization |  | (581) | (778)
Net carrying amount |  | 2,419 | 2,222
Equity component: |  |  |
Current portion of liability component included under short-term debt |  | 360 |
Long-term portion of liability component included under long-term debt |  | 2,059 | 2,222
Liability component total |  | $ 2,419 | $ 2,222
[1] | Recorded on the consolidated balance sheets as additional paid-in capital.

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