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Debt (Annual Principal Maturities of Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt [Abstract]    
2021 $ 0  
2022 5,333  
2023 8,000  
2024 6,667  
Total 20,000  
Less: Unamortized debt costs and discounts (516)  
Current portion of long-term debt (3,333) $ 0
Long-term debt $ 16,151