Supplemental Balance Sheet Information - Summary of Other Noncurrent Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Schedule Of Investments [Line Items]
Other assets	$ 4,121	$ 3,718
Operating Lease Right-of-Use Assets [Member]
Schedule Of Investments [Line Items]
Other assets	2,519	2,435
Other [Member]
Schedule Of Investments [Line Items]
Other assets	$ 1,602	$ 1,283