Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020	Oct. 31, 2020
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 4,075		$ 4,075		$ 4,075
Intangible assets, net	19,318		19,318		$ 19,967
Bridgeport Fuel Cell, LLC [Member]
Goodwill And Intangible Assets [Line Items]
Amortization expenses	$ 300	$ 300	$ 600	$ 700

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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