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Income Tax Expense - Additional information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Income Tax Expense |  |
Net operating loss carryforward - foreign | $ 3,855 | $ 3,855
Deferred tax assets, operating loss carry forwards, not subject to expiration | 12,100 |
Deferred tax assets, operating loss carry forwards, subject to expiration | 1,800 |
Deferred tax assets, operating loss carry forwards, state and local | 500 |
Deferred tax assets, tax credit carry forwards, research | 1,000 |
State research and other credit carry forwards with expiration date | 100 |
State research and other credit carry forwards without expiration date | 900 |
Deferred tax assets, valuation allowance | 1,347 | 1,513
Unrecognized tax benefits | 0 |
State and Local Jurisdiction |  |
Income Tax Expense |  |
Net operating loss carryforward - foreign | 13,900 |
Deferred tax assets, valuation allowance | 1,300 | 1,500
Net change in valuation allowance | (200) | 300
Foreign Country |  |
Income Tax Expense |  |
Deferred tax assets, valuation allowance | 400 | 500
Net change in valuation allowance | 100 |
Foreign Valuation Allowance |  |
Income Tax Expense |  |
Operating loss carry forwards, valuation allowance | $ 900 | $ 1,000

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