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Income Taxes - Schedule of Deferred Income Taxes (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Depreciable assets | $ (905) | $ (1,019)
Deferred revenue | 1,554 |
Accruals and reserves | 585 | 1,308
Stock-based compensation | 2,213 | 1,798
Impaired strategic investments | 1,666 | 1,687
NOL carryforwards | 3,308 | 4,637
U.S. Federal and state R&D credits | 2,394 | 1,896
Other | 689 | 538
Valuation allowance | (5,328) | (4,541)
Total deferred tax assets | $ 6,176 | $ 6,304

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