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Income Taxes - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
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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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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