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Long-Term Debt (Schedule of paycheck protection program loan liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Long-Term Debt    
Current portion of the PPP Loan included under short-term debt $ 312
Long-term portion of the PPP Loan included under long-term debt 1,187
Total $ 1,499