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Nature of Business, Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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Oct. 31, 2022
Nature of Business, Basis of Presentation and Significant Accounting Policies |
Percent of customer consolidated revenues | The percent of consolidated revenues from each customer for the years ended October 31, 2022, 2021 and 2020, respectively, are presented below. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 |  | 2020 |
Korea Fuel Cell Co., Ltd (KFC) | ​ | 46 | % | — | % | — | %
Connecticut Light and Power |  | 14 | % | 20 | % | 17 | %
ExxonMobil Technology and Engineering Company (f/k/a ExxonMobil Research and Engineering Company) (EMTEC) |  | 8 | % | 29 | % | 32 | %
Korea Southern Power Company (KOSPO) | ​ | 6 | % | 12 | % | — | %
U.S. Department of Energy (DOE) |  | 6 | % | 8 | % | 9 | %
Long Island Power Authority (LIPA) | ​ | 5 | % | — | % | — | %
Pfizer, Inc. |  | 2 | % | 5 | % | 4 | %
UIL Holdings Corporation |  | — | % | 5 | % | 18 | %
Total |  | 87 | % | 79 | % | 80 | %

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