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Nature of Business and Basis of Presentation - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2017 | Apr. 30, 2016 | Oct. 31, 2016
Nature of Business and Basis of Presentation [Line items] |  |  |  |  |  |
Debt issuance costs, deduction of current portion of debt | [1] | $ 129 |  | $ 129 |  | $ 152
Debt issuance costs, deduction of long-term debt and other liabilities | [2] | $ 161 |  | $ 161 |  | 225
POSCO Energy [Member] |  |  |  |  |  |
Nature of Business and Basis of Presentation [Line items] |  |  |  |  |  |
Common stock ownership percentage |  | 5.00% |  | 5.00% |  |
Significant customer revenue percentage |  | 7.00% | 52.00% | 8.00% | 48.00% |
NRG Energy, Inc. [Member] |  |  |  |  |  |
Nature of Business and Basis of Presentation [Line items] |  |  |  |  |  |
Common stock ownership percentage |  | 3.00% |  | 3.00% |  |
Significant customer revenue percentage |  | 0.30% | 0.40% | 0.40% | 0.20% |
Accounting Standards Update 2015-03 [Member] | Current Assets [Member] |  |  |  |  |  |
Nature of Business and Basis of Presentation [Line items] |  |  |  |  |  |
Debt issuance costs, deduction of current portion of debt |  |  |  |  |  | 300
Accounting Standards Update 2015-03 [Member] | Other Assets [Member] |  |  |  |  |  |
Nature of Business and Basis of Presentation [Line items] |  |  |  |  |  |
Debt issuance costs, deduction of long-term debt and other liabilities |  |  |  |  |  | $ 1,100
[1] | Represents the current portion of direct deferred finance costs relate primarily to securing a $40.0 million loan facility with NRG which is being amortized over the five-year life of the facility.
[2] | Represents the long-term portion of direct deferred finance costs relating to the Company’s loan facility with NRG which is being amortized over the five-year life of the facility.

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