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Stockholders' Equity - Additional Information (Details) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 13, 2018 | Dec. 14, 2017 | May 03, 2017 | Jul. 31, 2018 | Jul. 31, 2018 | Oct. 31, 2017
Stockholders' Equity Note |  |  |  |  |  |
Common stock, par value |  |  |  | $ 0.0001 | $ 0.0001 | $ 0.0001
Common stock, shares authorized |  |  |  | 225,000,000 | 225,000,000 | 125,000,000
Excess percentage of common shares outstanding |  | 19.90% |  |  |  |
Series C Warrants [Member] |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  |  |  | 11,569,364 | 11,569,364 | 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 | $ 5.83 |
Class of Warrant or Right, Outstanding |  |  |  | 7,680,000 | 7,680,000 |
At Market Issuance Sales Agreement [Member] | B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member] |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |
Common stock, par value | $ 0.0001 |  |  |  |  |
Sales commission as a percentage of gross proceeds | 3.00% |  |  |  |  |
At Market Issuance Sales Agreement [Member] | Maximum [Member] | B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member] |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |
Aggregate offering price | $ 50,000,000 |  |  |  |  |
Convertible Preferred Offering [Member] | Series C Preferred Stock [Member] |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |
Preferred stock offering date |  | 2017-09 |  |  |  |
Underwritten Public Offering [Member] |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |
Stock issued during period, shares, new issues |  |  | 12,000,000 |  |  |
Underwritten Public Offering [Member] | Series C Warrants [Member] |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |
Class of warrants or rights issued |  |  | 12,000,000 |  |  |
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 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 1.28 |  |  |
Class of warrant or right term |  |  | 1 year |  |  |
Common Stock | 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 | 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 | 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 |  |  |  | 5,200,000 |  |
Stock issued during period on sales agreement |  |  |  | $ 6,700,000 |  |
Sale of common stock net of fees |  |  |  | $ 400,000 |  |

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