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Income Taxes - Schedule of Deferred Income Taxes, Net (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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Income Tax Disclosure [Abstract] |  |
Depreciable assets | $ (5,106) | $ (1,964)
Deferred revenue | 2,130 | 2,029
Accruals and reserves | 1,572 | 1,858
Stock-based compensation | 1,997 | 2,232
Impaired strategic investments | 1,782 | 1,767
NOL carryforwards | 4,319 | 3,526
U.S. Federal and state R&D credits | 3,066 | 3,216
Other | 618 | 897
Valuation allowance | (7,253) | (6,246)
Deferred taxes, net | $ 3,125 | $ 7,315

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