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Nature of Business, Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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Oct. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Percent of Customer Consolidated Revenues | The percent of consolidated revenues from each customer for the years ended October 31, 2020, 2019 and 2018, respectively, are presented below.
|  | 2020 |  |  | 2019 |  |  | 2018 |
ExxonMobil Research and Engineering Company (EMRE) |  |  | 32 | % |  |  | 40 | % |  |  | 6 | %
UIL Holdings Corporation |  |  | 18 | % |  |  | 1 | % |  |  | 2 | %
Connecticut Light and Power |  |  | 17 | % |  |  | 11 | % |  |  | — | %
U.S. Department of Energy (DOE) |  |  | 9 | % |  |  | 6 | % |  |  | 8 | %
Clearway Energy (formerly NRG Yield, Inc.) |  |  | 6 | % |  |  | 1 | % |  |  | 15 | %
Pfizer, Inc. |  |  | 4 | % |  |  | 6 | % |  |  | 4 | %
Dominion Bridgeport Fuel Cell, LLC (a) |  |  | — | % |  |  | 13 | % |  |  | 3 | %
POSCO Energy |  |  | — | % |  |  | 3 | % |  |  | 5 | %
Hanyang Industrial Development Co., Ltd. (HYD) |  |  | — | % |  |  | — | % |  |  | 35 | %
AEP Onsite Partners, LLC |  |  | — | % |  |  | — | % |  |  | 10 | %
Total |  |  | 86 | % |  |  | 81 | % |  |  | 88 | %
(a) | 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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