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Stockholders' Equity - Additional Information (Details) - USD ($) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 13, 2018 | May 03, 2017 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016 | Apr. 30, 2018 | Dec. 14, 2017
Stockholders' Equity Note |  |  |  |  |  |  |
Common stock, shares authorized |  |  | 225,000,000 | 125,000,000 | 75,000,000 |  |
Common stock, par value |  |  | $ 0.0001 | $ 0.0001 |  |  |
Common stock price per share |  |  |  |  |  | $ 1.86 |
Excess percentage of common shares outstanding |  |  |  |  |  |  | 19.90%
Series C Warrants [Member] |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  |  | 11,569,364 | 11,580,900 |  |  |
Series D Warrants [Member] |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  |  |  | 2,584,174 |  |  |
Series A Warrants [Member] |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 5.83 |  |  |  |
Class of Warrant or Right, Outstanding |  |  | 7,680,000 |  |  |  |
Series B Warrants [Member] |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 0.0001 |  |  |  |
Class of Warrant or Right, Outstanding |  |  | 4,926,000 |  | 3,826,000 |  |
At Market Issuance Sales Agreement [Member] | B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member] |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |
Percentage of sales commission | 3.00% |  |  |  |  |  |
At Market Issuance Sales Agreement [Member] | B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member] | Maximum [Member] |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |
Aggregate offering price | $ 50,000,000 |  |  |  |  |  |
Underwritten Public Offering [Member] |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  | 12,000,000 |  |  |  |  |
Gross proceeds from common stock and warrants |  | $ 15,400,000 |  |  |  |  |
Common stock price per share |  | $ 1.28 |  |  |  |  |
Net proceeds from common stock and warrants |  | $ 13,900,000 |  |  |  |  |
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 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  |  | 5,715,180 | 7,245,430 | 6,023,372 |  |
Stock issued during period on sales agreement |  |  |  | $ 12,600,000 | $ 36,100,000 |  |
Sale of common stock net of fees |  |  |  | $ 100,000 | $ 100,000 |  |
Common Stock [Member] | Series C Warrants [Member] |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  |  | 11,536 |  |  |  |
Net proceeds from common stock and warrants |  |  | $ 20,000 |  |  |  |
Common Stock [Member] | Series D Warrants [Member] |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  |  | 2,584,174 |  |  |  |
Net proceeds from common stock and warrants |  |  | $ 3,300,000 |  |  |  |
Common Stock [Member] | At Market Issuance Sales Agreement [Member] | B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member] |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |
Stock issued during period, shares, new issues |  |  | 5,700,000 |  |  |  |
Stock issued during period on sales agreement |  |  | $ 8,000,000 |  |  |  |
Sale of common stock net of fees |  |  | $ 900,000 |  |  |  |

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