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Income Taxes - Schedule of Reconciliation Difference of Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Income Tax Disclosure [Abstract] |  |  |
Amount at statutory U.S. federal income tax rate | $ 522 | $ (4,724) | $ 1,333
Change because of the following items: |  |  |
State income taxes, net of federal benefit | (632) | (897) | (273)
Foreign and state rate differential | 495 | 628 | 596
U.S. federal and foreign R&D credits | (1,544) | (1,511) | (920)
Valuation allowance change | 4,083 | 10,978 | 1,059
Stock-based compensation | 1,003 | 481 | (544)
U.S. Federal and state rate change | (152) |  | (35)
Tax reserve change | 734 | (123) | (150)
Foreign-derived income deduction | (403) |  |
Contingent consideration | (164) | 13 | 3
Impact of CARES Act |  |  | 735
Acquisition-related transaction costs |  |  | 187
Other | 81 | (64) | 118
Total income tax expense | $ 4,023 | $ 4,781 | $ 2,109

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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to contingent consideration (gain) expense. + References No definition available. + Details
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