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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 03, 2017 | Oct. 31, 2017 | Jul. 31, 2017 | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015 | Apr. 28, 2017 | Jul. 30, 2014
Stockholders' Equity Note |  |  |  |  |  |  |  |
Common stock, shares authorized |  | 125,000,000 |  | 125,000,000 | 75,000,000 |  |  |
Common stock price per share |  |  |  |  |  |  | $ 1.15 |
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
Warrants expiration date |  |  |  | Jul. 30, 2017 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  |  |  | 7,245,430 | 6,023,372 | 1,845,166 |  |
Stock issued during period on open market, net of fees |  |  |  | $ 12.6 | $ 36.1 |  |  |
Selling commissions |  |  |  | $ 0.1 | $ 0.1 |  |  |
Series C Warrants [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  | 11,580,900 |  | 11,580,900 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 11,580,900 |  | 11,580,900 |  |  |  |
Series C Warrants [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  | 419,100 |  |  |  |  |  |
Net proceeds from common stock and warrants |  | $ 0.7 |  |  |  |  |  |
Series D Warrants [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  | 2,584,174 |  | 2,584,174 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 2,584,174 |  | 2,584,174 |  |  |  |
Series D Warrants [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  | 9,415,826 | 9,415,826 |  |  |  |  |
Net proceeds from common stock and warrants |  | $ 12.1 | $ 12.1 |  |  |  |  |
Series A Warrants [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 5.83 |  | $ 5.83 |  |  |  |
Class of Warrant or Right, Outstanding |  | 7,680,000 |  | 7,680,000 |  |  |  |
Series B Warrants [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 0.0001 |  | $ 0.0001 |  |  |  |
Class of Warrant or Right, Outstanding |  | 4,926,000 |  | 4,926,000 | 3,826,000 |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  | 3,826,000 |  |  |
Underwritten Public Offering [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues | 12,000,000 |  |  |  |  |  |  |
Gross proceeds from common stock and warrants | $ 15.4 |  |  |  |  |  |  |
Common stock price per share | $ 1.28 |  |  |  |  |  |  |
Net proceeds from common stock and warrants | $ 13.9 |  |  |  |  |  |  |
Underwritten Public Offering [Member] | Series C Warrants [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |
Class of warrants or rights issued | 12,000,000 |  |  |  |  |  |  |
Warrants issued, price per share | $ 1.28 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 1.60 |  |  |  |  |  |  |
Class of warrant or right term | 5 years |  |  |  |  |  |  |
Underwritten Public Offering [Member] | Series D Warrants [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |
Class of warrants or rights issued | 12,000,000 |  |  |  |  |  |  |
Warrants issued, price per share | $ 1.28 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 1.28 |  |  |  |  |  |  |
Class of warrant or right term | 1 year |  |  |  |  |  |  |

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