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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 |  |  |  |

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