Summary of Significant Accounting Policies and Select Balance Sheet Information - Balance Sheet Classification and Amounts of Right-of-Use Assets and Lease Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Operating lease liabilities:
Other accrued liabilities	$ 963	$ 518
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued other	Accrued other
Operating lease liabilities	$ 3,843	$ 3,188
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other long-term liabilities	Other long-term liabilities
Total operating lease liabilities	$ 4,806