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Reconciliation of Actual Income Tax Expenses (Benefits) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Income Tax Disclosure [Abstract] |  |
Expense (benefit) for U.S federal income tax at statutory rate | $ 477 | $ (4,849)
Effect of foreign income taxes | (101) | (47)
Research and experimentation tax credit | (812) | (320)
State income taxes, net of federal income tax benefit | (161) | (23)
Nondeductible expenses | 105 | 33
Resolution of prior years’ tax matters | 14 | (657)
Change in valuation allowance | 964 | (4,237)
Impact on deferred taxes due to change in tax rate |  | 8,116
Difference in U.S. tax rate from assumed rate |  | 511
Change in fair value of contingent consideration | (444) |
Foreign income tax withholding | 2,358 | 11
Disallowance of stock compensation adjustments in excess of book | 31 | 895
Other items | (14) | (13)
Income tax expense | $ 2,417 | $ (580)
Effective tax rate | 106.40% | 2.90%

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