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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
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Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
Concentration Risk [Line Items] |  |  |
Significant customer revenue percentage | 80.00% | 86.00% | 79.00%
ExxonMobil Research and Engineering Company (EMRE) [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Significant customer revenue percentage | 40.00% | 6.00% | 9.00%
Dominion Bridgeport FuelCell Park [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Significant customer revenue percentage | 13.00% | 3.00% | 11.00%
Connecticut Light and Power [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Significant customer revenue percentage | 11.00% | 0.00% | 0.00%
U.S. Department of Energy (DOE) [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Significant customer revenue percentage | 6.00% | 8.00% | 9.00%
Pfizer, Inc. [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Significant customer revenue percentage | 6.00% | 4.00% | 4.00%
POSCO Energy [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Significant customer revenue percentage | 3.00% | 5.00% | 6.00%
Clearway Energy (formerly NRG Yield, Inc.) [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Significant customer revenue percentage | 1.00% | 15.00% | 0.00%
Hanyang Industrial Development Co., Ltd. (HYD) [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Significant customer revenue percentage | 0.00% | 35.00% | 40.00%
AEP Onsite Partners, LLC [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Significant customer revenue percentage | 0.00% | 10.00% | 0.00%

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