Income Taxes - Schedule of Reconciliation Difference of Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Amount at statutory U.S. federal income tax rate	$ (4,724)	$ 1,333	$ (305)
Change because of the following items:
State income taxes, net of federal benefit	(897)	(273)	(551)
Foreign and state rate differential	628	596	212
U.S. federal and foreign R&D credits	(1,511)	(920)	(1,571)
Valuation allowance change	10,978	1,059	825
Stock-based compensation	481	(544)	(81)
U.S. Federal and state rate change		(35)	17
Tax reserve change	(123)	(150)	609
Foreign-derived income deduction			(88)
Impact of CARES Act		735	1,700
Acquisition-related transaction costs		187
Other	(51)	121	56
Total income tax expense (benefit)	$ 4,781	$ 2,109	$ (2,577)

Income tax expense benefit items of income tax reconciliation.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) attributable to enactment of the Coronavirus Aid, Relief and Economic Security Act (the “CARES Act”).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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