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Nature of Business, Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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Oct. 31, 2018
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, 2018, 2017 and 2016, respectively, are presented below.
|  | 2018 |  |  | 2017 |  |  | 2016 |
Hanyang Industrial Development Co., LTD |  |  | 35 | % |  |  | 40 | % |  |  | — | %
Clearway Energy (formerly NRG Yield, Inc.) |  |  | 15 | % |  |  | — | % |  |  | — | %
AEP Onsite Partners, LLC |  |  | 10 | % |  |  | — | % |  |  | — | %
U.S. Department of Energy |  |  | 8 | % |  |  | 9 | % |  |  | 8 | %
ExxonMobil |  |  | 6 | % |  |  | 9 | % |  |  | 3 | %
POSCO Energy |  |  | 5 | % |  |  | 6 | % |  |  | 48 | %
Dominion Bridgeport Fuel Cell, LLC |  |  | 3 | % |  |  | 11 | % |  |  | 6 | %
Avangrid Holdings (through its various subsidiaries) |  |  | 2 | % |  |  | 3 | % |  |  | 10 | %
Total |  |  | 84 | % |  |  | 78 | % |  |  | 75 | %

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