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Long-Term Debt (Schedule of paycheck protection program loan liabilities) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Long-Term Debt |  |
Current portion of the PPP Loan included under short-term debt | $ 687 | $ 312
Long-term portion of the PPP Loan included under long-term debt | 812 | 1,187
Liability component total | $ 1,499 | $ 1,499

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