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Acquisition - Additional Information (Details) |  | 12 Months Ended |
--- | --- | --- | ---
May 09, 2019 USD ($) MW | Oct. 31, 2019 USD ($) | Oct. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |
Restricted cash |  | $ 30,344,000 | $ 42,185,000
Bridgeport Fuel Cell, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business acquisition, cash purchase price | $ 35,500,000 |  |
Working capital post-closing adjustment for purchase price | 1,000,000.0 |  |
Purchase price, estimated working capital adjustment | 600,000 |  |
Accounts receivable | 2,700,000 |  |
Unbilled receivables | 15,300,000 |  |
Accrued performance guarantees | 1,300,000 |  |
Assets acquired, fuel cell power plants installation | 38,800,000 |  |
Assets acquired, power purchase agreement | 12,300,000 |  |
Gain or loss recorded for pre-existing service agreement | $ 0 |  |
Remaining amortization period |  | 10 years |
Bridgeport Fuel Cell, LLC [Member] | Project Asset [Member] | Balance of Plant Assets [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Project assets estimated remaining useful lives |  | 15 years |
Bridgeport Fuel Cell, LLC [Member] | Project Asset [Member] | Minimum [Member] | Fuel Cell Modules [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Project assets estimated remaining useful lives |  | 1 year |
Bridgeport Fuel Cell, LLC [Member] | Project Asset [Member] | Maximum [Member] | Fuel Cell Modules [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Project assets estimated remaining useful lives |  | 7 years |
Bridgeport Fuel Cell, LLC [Member] | Bridgeport, Connecticut [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Capacity of plant | MW | 14.9 |  |
Plant operation period | 2013-12 |  |
Bridgeport Fuel Cell Project [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Restricted cash | $ 15,000,000 |  |

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