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Income Taxes - Schedule of Reconciliation Difference of Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
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.