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Summary of Significant Accounting Policies - Summary of Anticipated Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
2021 (remaining 3 months) $ 47  
2022 185  
2023 123  
2024 26  
Intangible assets, Net Carrying Value $ 381 $ 527