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Reconciliation of Actual Income Tax Expenses (Benefits) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Income Tax Disclosure [Abstract] |  |
Expense (benefit) for U.S federal income tax at statutory rate | $ (3,484) | $ 477
Effect of foreign income taxes | (64) | (101)
Research and experimentation tax credit | (1,201) | (812)
State income taxes, net of federal income tax benefit | (158) | (161)
Nondeductible expenses | 63 | 105
Resolution of prior years’ tax matters | (7) | 14
Change in valuation allowance | 4,882 | 964
Impact on deferred taxes due to change in tax rate | 196 |
Change in fair value of contingent consideration | 214 | (444)
Foreign income tax withholding | 1,928 | 2,358
Disallowance of stock compensation adjustments in excess of book | 255 | 31
Other items | 25 | (14)
Income tax expense | $ 2,649 | $ 2,417
Effective tax rate | (16.00%) | 106.40%

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