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Nature of Business and Basis of Presentation - Additional Information (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 MW | Jul. 31, 2017 USD ($) | Jul. 31, 2016 | Sep. 30, 2017 Employee | Jul. 31, 2017 USD ($) | Jul. 31, 2016 | Oct. 31, 2016 USD ($)
Nature of Business and Basis of Presentation [Line items] |  |  |  |  |  |  |  |
Debt issuance costs, deduction of current portion of long term debt | [1] |  | $ 129 |  |  | $ 129 |  | $ 152
Debt issuance costs, deduction of long-term debt and other liabilities | [2] |  | $ 129 |  |  | $ 129 |  | 225
Reduction in production capacity due to production rate adjustment | MW |  | 15 |  |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |
Nature of Business and Basis of Presentation [Line items] |  |  |  |  |  |  |  |
Number of manufacturing employees | Employee |  |  |  |  | 110 |  |  |
POSCO Energy [Member] |  |  |  |  |  |  |  |
Nature of Business and Basis of Presentation [Line items] |  |  |  |  |  |  |  |
Common stock ownership percentage |  |  | 4.00% |  |  | 4.00% |  |
Significant customer revenue percentage |  |  | 13.00% | 65.00% |  | 9.00% | 52.00% |
NRG Energy, Inc. [Member] |  |  |  |  |  |  |  |
Nature of Business and Basis of Presentation [Line items] |  |  |  |  |  |  |  |
Common stock ownership percentage |  |  | 2.00% |  |  | 2.00% |  |
Significant customer revenue percentage |  |  | 0.60% | 0.30% |  | 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 long term 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 that 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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