Nature of Business, Basis of Presentation and Significant Accounting Policies (Tables)

12 Months Ended

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	%