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Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020	Oct. 31, 2020
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 4,075		$ 4,075		$ 4,075
Intangible assets, net	18,994		18,994		$ 19,967
Impairment of goodwill	0
Bridgeport Fuel Cell, LLC
Goodwill And Intangible Assets [Line Items]
Amortization expenses	$ 300	$ 300	$ 1,000	$ 1,000

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- Definition

Goodwill and intangible assets.

+ References

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- Definition

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.

+ References

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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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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