Lease Obligations - Schedule of Maturity Analysis of Operating Lease Liabilities and Reconciliation of Undiscounted Cash Flows to Total Operating Lease Liability (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Leases [Abstract]
Due in one year or less	$ 481
Due after one year through two years	521
Due after two years through three years	522
Due after three years through four years	522
Due after four years through five years	524
Thereafter	2,975
Total undiscounted cash flows	5,545
Discount on cash flows	(952)
Total operating lease liability	$ 4,593	$ 5,294