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Nature of Business, Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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Oct. 31, 2017
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, 2017, 2016 and 2015, respectively, are presented below.
|  | 2017 |  |  | 2016 |  |  | 2015 |
Hanyang Industrial Development Co., LTD |  |  | 40 | % |  |  | — | % |  |  | — | %
Dominion Bridgeport Fuel Cell, LLC |  |  | 11 | % |  |  | 6 | % |  |  | 3 | %
Department of Energy |  |  | 9 | % |  |  | 8 | % |  |  | 5 | %
ExxonMobil |  |  | 9 | % |  |  | 3 | % |  |  | 1 | %
POSCO Energy |  |  | 6 | % |  |  | 48 | % |  |  | 67 | %
Avangrid Holdings (through its various subsidiaries) |  |  | 3 | % |  |  | 10 | % |  |  | 14 | %
Total |  |  | 78 | % |  |  | 75 | % |  |  | 90 | %

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- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6442-108592 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6327-108592 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 + Details
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