Leases - Additional Information (Details)		12 Months Ended
	Feb. 11, 2020 USD ($) MW	Oct. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Oct. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Nov. 01, 2019 USD ($)
Lessee Lease Description [Line Items]
Operating lease ROU asset		$ 10,098,000				$ 10,300,000
Operating lease liability		10,756,000				10,100,000
Accumulated deficit		(1,164,196,000)		$ (1,075,089,000)		$ 0
Finance lease ROU assets		$ 40,000.00
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		us-gaap:PropertyPlantAndEquipmentNet
Finance lease, liability		$ 38,000		141,000
Finance Lease, Liability, Statement of Financial Position [Extensible List]		us-gaap:OtherLiabilitiesNoncurrent
Operating lease cost		$ 1,500,000
Operating lease, weighted average remaining lease term		20 years
Operating lease, weighted average discount rate		6.27%
Operating lease, payments		$ 1,016,000		$ 0	$ 0
Crestmark Sale-Leaseback Transaction [Member]
Lessee Lease Description [Line Items]
Initial term of lease	10 years
Down payment and an initial rental payment under lease	$ 2,900,000
Monthly lease payments due	100,000
Remaining lease payments due	$ 9,300,000	$ 8,600,000
Purchase and Sale Agreement [Member] | Central CA Fuel Cell 2, LLC [Member] | Crestmark Sale-Leaseback Transaction [Member] | Tulare BioMAT [Member] | California [Member]
Lessee Lease Description [Line Items]
Capacity of plant | MW	2.8
Sale of plant	$ 14,400,000
Computer and Office Equipment and Manufacturing Facilities [Member]
Lessee Lease Description [Line Items]
Operating lease, rent expense			$ 1,000,000.0		$ 1,200,000
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