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Long-Term Debt (Schedule of paycheck protection program loan liabilities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Long-Term Debt    
Current portion of the PPP Loan included under short-term debt $ 500 $ 312
Long-term portion of the PPP Loan included under long-term debt 999 1,187
Liability component total $ 1,499 $ 1,499