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Long-Term Debt (Schedule of operating lease liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Long-Term Debt |  |
Current portion of liability component | $ 579 | $ 577
Operating lease liabilities, net of current portion | 1,489 | 2,021
Total operating lease liabilities | $ 2,068 | $ 2,598
Weighted average remaining lease term for operating leases (in years) | 3 years 6 months 14 days | 4 years 5 months 5 days
Weighted average discount rate for operating leases | 6.10% | 6.10%

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