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Acquisition - Additional Information (Details) |  | 12 Months Ended
--- | --- | ---
May 09, 2019 USD ($) MW | Oct. 31, 2019
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 |
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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