Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Impairment loss on intangible assets	$ 3,719,000
Amortization expense recognized	100,000	$ 300,000
Amortization expense for remainder of fiscal year and thereafter	$ 0
Intangible assets remaining amortization term	0 years
Customer Relationships [Member] | American Capacity Purchase Agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment loss on intangible assets	$ 3,700,000