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Nature of Business, Basis of Presentation and Significant Accounting Policies - Percent of Customer Consolidated Revenues (Details) - Sales Revenue Net [Member] - Customer Concentration Risk [Member] | 12 Months Ended
--- | ---
Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2018
Concentration Risk [Line Items] |  |  |  |
Significant customer revenue percentage |  | 86.00% | 81.00% | 88.00%
ExxonMobil Research and Engineering Company (EMRE) [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Significant customer revenue percentage |  | 32.00% | 40.00% | 6.00%
UIL Holdings Corporation [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Significant customer revenue percentage |  | 18.00% | 1.00% | 2.00%
Connecticut Light and Power [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Significant customer revenue percentage |  | 17.00% | 11.00% | 0.00%
U.S. Department of Energy (DOE) [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Significant customer revenue percentage |  | 9.00% | 6.00% | 8.00%
Clearway Energy (formerly NRG Yield, Inc.) [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Significant customer revenue percentage |  | 6.00% | 1.00% | 15.00%
Pfizer, Inc. [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Significant customer revenue percentage |  | 4.00% | 6.00% | 4.00%
Dominion Bridgeport FuelCell Park [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Significant customer revenue percentage | [1] | 0.00% | 13.00% | 3.00%
Posco Energy |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Significant customer revenue percentage |  | 0.00% | 3.00% | 5.00%
Hanyang Industrial Development Co., Ltd. (HYD) [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Significant customer revenue percentage |  | 0.00% | 0.00% | 35.00%
AEP Onsite Partners, LLC [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Significant customer revenue percentage |  | 0.00% | 0.00% | 10.00%
[1] | All of the outstanding membership interests in Dominion Bridgeport Fuel Cell, LLC were acquired by the Company on May 9, 2019. As a result of this acquisition, revenue is now (subsequent to the acquisition) recognized under the related PPA for electricity sales to Connecticut Light and Power.

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