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Accounts Receivable - Additional Information (Details) - USD ($) $ in Thousands | Jul. 31, 2017 | Oct. 31, 2016
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Accounts Notes And Loans Receivable [Line Items] |  |
Allowance for Doubtful Accounts Receivable, Current | $ 100 | $ 200
POSCO Energy [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Accounts Receivable, Related Parties, Current | 2,000 | 5,000
NRG Energy, Inc. [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Accounts Receivable, Related Parties, Current | $ 20 | $ 100

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