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Reconciliation of Actual Income Tax Expenses (Benefits) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Income Tax Disclosure [Abstract] |  |  |
Benefit for U.S federal income tax at statutory rate | $ (4,849) | $ (18,940) | $ (19,365)
Effect of foreign income taxes | (47) | 124 | 630
Research and experimentation tax credit | (320) | (248) | (686)
State income taxes, net of federal income tax benefit | (23) |  | 4
Nondeductible expenses | 33 | 164 | 149
Resolution of prior years’ tax matters | (657) | 2 | 2,400
Change in valuation allowance | (4,237) | 20,087 | 7,715
Impact on deferred taxes due to change in tax rate | 8,116 | (6) | (124)
Difference in U.S. tax rate from assumed rate | 511 |  |
Foreign income taxes | 11 | 506 |
Disallowance of stock compensation adjustments in excess of book | 895 | 1,074 |
Other items | (13) | (80) | (86)
Income tax expense | $ (580) | $ 2,683 | $ (9,363)
Effective tax rate | 2.90% | (5.00%) | 16.90%

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