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Goodwill and Other Intangible Assets - Estimated Aggregate Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2021 $ 153  
2022 481  
2023 282  
2024 87  
2025 11  
Thereafter 5  
Future Amortization Expense, Total $ 1,019 $ 1,563