Summary of Significant Accounting Policies - Summary of Right-of-Use Assets And Lease Liabilities Associated With Operating Leases Included In Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands |
Sep. 30, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Accounting Policies [Abstract] | ||
| Right-of-use assets | $ 3,250 | $ 3,075 |
| Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:PrepaidExpensesAndOtherCurrentAssetsMember | us-gaap:PrepaidExpensesAndOtherCurrentAssetsMember |
| Lease liabilities | $ 2,714 | $ 2,659 |
| Operating Lease, Liability, Statement of Financial Position [Extensible List] | Accounts Payable and Other Liabilities | Accounts Payable and Other Liabilities |