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Income Taxes - Schedule of Deferred Income Taxes, Net (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
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Income Tax Disclosure [Abstract] |  |
Depreciable assets | $ (3,802) | $ (3,995)
Deferred revenue | 1,082 | 2,103
Accruals and reserves | 2,052 | 1,615
Stock-based compensation | 2,665 | 2,443
Impaired strategic investments | 1,829 | 1,787
NOL carryforwards | 4,578 | 6,379
U.S. Federal and state R&D credits | 2,973 | 4,465
Capitalized R&D expenses | 7,976 |
Other | 648 | 848
Valuation allowance | (22,005) | (17,672)
Deferred taxes liabilities, net | $ (2,004) | $ (2,027)

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