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Debt - Xcel Term Loan Remaining Principal Payments (Details) - Xcel Term Loan - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt    
2021 (October 1 to December 31) $ 625  
2022 2,500  
2023 2,500  
2024 2,500  
2025 15,625  
Total $ 23,750 $ 16,750