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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
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Tax Credit Carryforward [Line Items] |  |  |  |
Federal net operating loss carryforwards | $ 18,900 |  |  |
Federal and state net operating loss and tax credit carryforwards | 140,962 | $ 126,547 |  |
State net operating loss carryforwards | 39,900 |  |  |
Valuation allowance | 35,758 | 27,578 |  |
Unrecognized tax benefits | 1,995 | $ 2,420 | $ 3,358 | $ 3,358
Uncertain tax positions that will reverse within next twelve months | 400 |  |  |
Federal tax authority |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Federal and state net operating loss and tax credit carryforwards | $ 84,100 |  |  |

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