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Long-term Debt - Schedule of Maturities of Future Principal Obligations of Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Remainder of 2021 $ 78  
2022 346  
2023 0  
2024 0  
2025 0  
Thereafter 0  
Total debt $ 424 $ 5,212