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Income Taxes - Schedule of Reconciliation between Effective Tax Rate Income from Continuing Operations and Statutory Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax (benefit) provision at federal statutory rate	$ (19,004)	$ (26,555)	$ (49,280)
(Reduction) increase in income taxes resulting from:
State taxes, net of federal tax benefit	(1,321)	(2,062)	(3,953)
Nondeductible stock compensation expenses	173	313	251
Permanent items	232	225	206
Change in valuation allowances	20,141	18,201	(22)
162(m) limitation	67	285	11
Impact of changing rates on deferred tax assets	501	499	(247)
Expired tax attributes	(612)	200	964
Other	342	149	80
Provision/(Benefit) for income taxes	$ 519	$ (8,745)	$ (51,990)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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