Inventories - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018	Oct. 31, 2018
Inventory [Line Items]
Long-term inventory	$ 2,179,000		$ 2,179,000
Costs of Revenues [Member]
Inventory [Line Items]
Excess plant capacity and manufacturing variances cost incurred	4,400,000	$ 3,000,000	11,000,000	$ 8,500,000
Bridgeport Fuel Cell, LLC [Member]
Inventory [Line Items]
Long-term inventory	$ 2,200,000		$ 2,200,000		$ 0