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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
	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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