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

12 Months Ended

Oct. 31, 2019

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, 2019, 2018 and 2017, respectively, are presented below.

	2019			2018			2017
ExxonMobil Research and Engineering Company (EMRE)		40	%		6	%		9	%
Dominion Bridgeport Fuel Cell, LLC		13	%		3	%		11	%
Connecticut Light and Power		11	%		—	%		—	%
U.S. Department of Energy (DOE)		6	%		8	%		9	%
Pfizer, Inc.		6	%		4	%		4	%
POSCO Energy		3	%		5	%		6	%
Clearway Energy (formerly NRG Yield, Inc.)		1	%		15	%		—	%
Hanyang Industrial Development Co., Ltd. (HYD)		—	%		35	%		40	%
AEP Onsite Partners, LLC		—	%		10	%		—	%
Total		80	%		86	%		79	%