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Long-Term Debt - Debt Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
2022 $ 30,789  
2023 34,211  
Outstanding principal 65,000 $ 65,000
Final payment 3,151  
2022 30,789  
2023 37,362  
Total aggregate future principal payments $ 68,151