Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2023
Income Tax Disclosure [Line Items]
Income tax expense	$ (1,743,000)	$ (13,303,000)	$ (1,724,000)	$ (13,506,000)
U.S. federal statutory tax rate			21.00%
Valuation allowance percentage	50.00%		50.00%
Unrecognized tax benefits excluding interest and penalties that would impact effective tax rate	$ 2,900,000		$ 2,900,000		$ 3,100,000
Undistributed earnings in foreign subsidiaries	0		0		$ 0
Maximum [Member]
Income Tax Disclosure [Line Items]
Discrete tax benefits related to stock-based compensation awards	$ 100,000	$ 100,000	$ 100,000	$ 100,000