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Reconciliation of Actual Income Tax Expenses (Benefits) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Income Tax Disclosure [Abstract] |  |
Expense for U.S federal income tax at statutory rate | $ (2,834) | $ (3,484)
Effect of foreign income taxes | 1 | (64)
Research and experimentation tax credit | (223) | (1,201)
State income taxes, net of federal income tax benefit | 153 | (158)
Nondeductible expenses | 44 | 63
Change in valuation allowance | 2,893 | 4,882
Impact on deferred taxes due to change in tax rate | 563 | 196
Change in fair value of contingent consideration | (569) | 214
Foreign income tax withholding | 419 | 1,928
Disallowance of stock compensation adjustments in excess of book | 334 | 255
Other items | (203) | 18
Income tax expense | $ 578 | $ 2,649
Effective tax rate | (4.30%) | (16.00%)

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