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Intangible Assets - Estimated Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Intangible Assets    
2021 (Remainder) $ 611  
2022 2,445  
2023 2,438  
2024 2,174  
2025 2,113  
Thereafter 13,398  
Total intangible assets, net $ 23,179 $ 19,248