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Leases - Future Minimum Rental Commitments Under Lease Agreements (Detail)
$ in Thousands
Sep. 30, 2021
USD ($)
Leases [Abstract]  
Remainder of 2021 $ 166
2022 610
2023 624
2024 609
2025 and thereafter 489
Total future minimum lease obligations 2,498
Less imputed interest (537)
Total lease liabilities $ 1,961