Leases - Additional Information (Details)			2 Months Ended	12 Months Ended
	Aug. 25, 2021 USD ($) MW	Feb. 11, 2020 USD ($) MW	Oct. 31, 2021 USD ($)	Oct. 31, 2021 USD ($)	Oct. 31, 2020 USD ($)	Oct. 31, 2019 USD ($)	Nov. 01, 2019 USD ($)
Lessee Lease Description [Line Items]
Operating lease ROU asset			$ 8,109,000	$ 8,109,000	$ 10,098,000		$ 10,300,000
Operating lease liability			9,125,000	9,125,000			10,100,000
Accumulated deficit			(1,265,251,000)	(1,265,251,000)	(1,164,196,000)		$ 0
Finance lease ROU assets			$ 100,000	$ 100,000	$ 40,000.00
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]			Property, plant and equipment, net	Property, plant and equipment, net	Property, plant and equipment, net
Finance lease, liability			$ 102,000	$ 102,000	$ 38,000
Finance Lease, Liability, Statement of Financial Position [Extensible List]			Current portion of long-term debt, Long-term debt and other liabilities	Current portion of long-term debt, Long-term debt and other liabilities	Current portion of long-term debt, Long-term debt and other liabilities
Operating lease expense				$ 1,545,000	$ 1,451,000
Operating lease, weighted average remaining lease term			20 years	20 years
Operating lease, weighted average discount rate			8.15%	8.15%
Operating lease, payments				$ 1,226,000	1,016,000
Purchase price			$ 141,587,000	141,587,000	133,372,000
Remaining lease payments due			$ 5,300,000
Crestmark Sale-Leaseback Transaction
Lessee Lease Description [Line Items]
Capacity of plant | MW	1.4
Sale of plant	$ 5,300,000
Purchase price	$ 10,200,000
Power purchase agreement term	20 years
Initial term of lease	10 years
Down payment and initial rental payment under lease	$ 2,200,000
Reserve for Debt Service and Future Module Replacement	$ 2,500,000
Purchase and Sale Agreement [Member] | Central CA Fuel Cell 2, LLC [Member] | Crestmark Sale-Leaseback Transaction [Member] | Tulare BioMAT [Member] | CANADA
Lessee Lease Description [Line Items]
Capacity of plant | MW		2.8
Sale of plant		$ 14,400,000
Initial term of lease		10 years
Down payment and initial rental payment under lease		$ 2,900,000
Monthly lease payments due		100,000
Remaining lease payments due		$ 9,300,000		$ 7,700,000	$ 8,600,000
Computer and Office Equipment and Manufacturing Facilities [Member]
Lessee Lease Description [Line Items]
Operating lease, rent expense						$ 1,000,000.0
Minimum [Member]
Lessee Lease Description [Line Items]
Operating and finance lease, remaining lease term				1 year
Maximum [Member]
Lessee Lease Description [Line Items]
Operating and finance lease, remaining lease term				26 years