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