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Income Tax Expense - Additional information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Income Tax Expense |  |
Operating loss carry forwards, valuation allowance | $ 500 | $ 500
Net operating loss carry forward - foreign | 3,714 | 3,396
Deferred tax assets, operating loss carry forwards, not subject to expiration | 11,100 |
Deferred tax assets, operating loss carry forwards, subject to expiration | 2,100 |
Deferred tax assets, operating loss carry forwards, state and local | 600 |
Deferred tax assets, tax credit carry forwards, research | 2,200 |
State research and other credit carry forwards with expiration date | 800 |
State research and other credit carry forwards without expiration date | 1,400 |
Deferred tax assets, valuation allowance | 1,772 | 1,208
Reduction in valuation allowance for excess foreign tax credits | 600 | 800
Unrecognized tax benefits | 0 |
Foreign Valuation Allowance |  |
Income Tax Expense |  |
Operating loss carry forwards, valuation allowance | 1,300 | $ 700
State and Local Jurisdiction |  |
Income Tax Expense |  |
Operating loss carry forwards, valuation allowance | 600 |
Net operating loss carry forward - foreign | $ 13,200 |

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