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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, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Amount at statutory U.S. federal income tax rate |  | $ 1,587 | $ (1,845) | $ 2,461
Change because of the following items: |  |  |  |
State income taxes, net of federal benefit |  | (452) | (724) | (13)
U.S. Federal and foreign research and development credits |  | (2,464) | (1,710) | (706)
Foreign and state rate differential |  | 156 | 371 | 948
Valuation allowance change |  | 671 | 960 | 665
Stock-based compensation | [1] | (163) | (2,063) | 330
Contingent consideration (gain) expense and related foreign currency revaluation |  | (61) | 142 | 125
U.S. Federal and state rate change |  | 44 | 1,582 |
Tax reserve change |  | 770 | 158 | (52)
Foreign-derived income deduction |  | (150) |  |
Federal manufacturing deduction |  |  |  | (313)
Other |  | 28 | 54 | (338)
Income tax (benefit) provision |  | $ (34) | $ (3,075) | $ 3,107
[1] | Includes non-deductible stock-based compensation.

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