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Debt - Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Long-term debt    
Less: Amounts due within one year $ (3,765) $ (2,041)
Long-term debt 4,265 5,686
Maturities of long-term debt    
2022 3,765  
2023 4,811  
Term loan    
Long-term debt    
Term loan payable 5,000 5,000
End of term fee 2,331 2,048
Unamortized debt issuance costs (145) (206)
Carrying value of term loan 7,186 6,842
Other long-term debt    
Long-term debt    
Carrying value of term loan $ 844 $ 885