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Shareholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2017 | Oct. 31, 2016 | Apr. 30, 2016
NRG Energy, Inc. [Member] |  |  |
Stockholders' Equity Note |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 40.20 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 200,000 |  |
Series A Warrant [Member] |  |  |
Stockholders' Equity Note |  |  |
Class of Warrant or Right, Outstanding | 7,680,000 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 5.83 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 7,680,000 |  | 0
Series B Warrant [Member] |  |  |
Stockholders' Equity Note |  |  |
Class of Warrant or Right, Outstanding | 4,926,000 | 3,826,000 |
Common Stock [Member] |  |  |
Stockholders' Equity Note |  |  |
Stock issued during period, shares, new issues | 7,200,000 |  |
Stock issued during period on open market, net of fees | $ 12.4 |  |

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