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Acquisition - Additional Information (Details) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 09, 2019 USD ($) MW | Jul. 31, 2019 USD ($) | Jul. 31, 2019 USD ($)
Bridgeport Fuel Cell, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business acquisition, purchase price | $ 35,500,000 |  |
Working capital post-closing adjustment for purchase price | 1,000,000 |  |
Purchase price, estimated working capital adjustment | 400,000 |  |
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 | $ 12,000,000 | $ 12,000,000
Gain or loss recorded for pre-existing service agreement | $ 0 |  |
Amortization expenses |  | 300,000 |
Remaining amortization period |  |  | 10 years
Bridgeport Fuel Cell, LLC [Member] | Project Asset [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price and adjusted balances of project assets value |  | 37,400,000 | $ 37,400,000
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 |  |  |
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 |  |  |
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 | $ 6,900,000 | $ 6,900,000

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