Supplemental Balance Sheet Information - Schedule of Other Long-term Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Other Liabilities Disclosure [Abstract]
Deferred consideration	$ 1,637	$ 1,629
Unrecognized tax benefits	3,301	3,332
Operating lease liabilities, less current portion	$ 3,436	$ 2,974
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other long-term liabilities	Other long-term liabilities
Other	$ 156	$ 125
Other long-term liabilities	$ 8,530	$ 8,060