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Nature of Business, Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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Oct. 31, 2019
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, 2019, 2018 and 2017, respectively, are presented below.
|  | 2019 |  |  | 2018 |  |  | 2017 |
ExxonMobil Research and Engineering Company (EMRE) |  |  | 40 | % |  |  | 6 | % |  |  | 9 | %
Dominion Bridgeport Fuel Cell, LLC |  |  | 13 | % |  |  | 3 | % |  |  | 11 | %
Connecticut Light and Power |  |  | 11 | % |  |  | — | % |  |  | — | %
U.S. Department of Energy (DOE) |  |  | 6 | % |  |  | 8 | % |  |  | 9 | %
Pfizer, Inc. |  |  | 6 | % |  |  | 4 | % |  |  | 4 | %
POSCO Energy |  |  | 3 | % |  |  | 5 | % |  |  | 6 | %
Clearway Energy (formerly NRG Yield, Inc.) |  |  | 1 | % |  |  | 15 | % |  |  | — | %
Hanyang Industrial Development Co., Ltd. (HYD) |  |  | — | % |  |  | 35 | % |  |  | 40 | %
AEP Onsite Partners, LLC |  |  | — | % |  |  | 10 | % |  |  | — | %
Total |  |  | 80 | % |  |  | 86 | % |  |  | 79 | %

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