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Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2024	Jul. 31, 2023	Oct. 31, 2023
Goodwill And Intangible Assets
Goodwill	$ 4,075		$ 4,075		$ 4,075
Intangible assets, net	15,104		15,104		$ 16,076
Impairment of goodwill			0
In-Process Research and Development
Goodwill And Intangible Assets
Indefinite-lived IPR&D intangible asset			0
Bridgeport Fuel Cell, LLC
Goodwill And Intangible Assets
Amortization expenses	$ 300	$ 300	$ 1,000	$ 1,000

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Goodwill and intangible assets.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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