Supplemental Balance Sheet Information - Schedule of Other Long-term Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Other Liabilities Disclosure [Abstract]
Deferred consideration	$ 4,188	$ 5,106
Contingent consideration	820	817
Unrecognized tax benefits	2,446	2,538
Operating lease liabilities	3,259	3,188
Other long-term liabilities	$ 10,713	$ 11,649