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Stockholders' Equity - Additional Information (Details) - USD ($) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Jun. 13, 2018 | May 03, 2017 | Jan. 31, 2019 | Oct. 31, 2018
Series C Warrants [Member] |  |  |  |
Stockholders' Equity Note |  |  |  |
Class of Warrant or Right, Outstanding |  |  | 11,569,364 | 11,569,364
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 |
Common Stock [Member] | Series C Warrants [Member] |  |  |  |
Stockholders' Equity Note |  |  |  |
Stock issued during period, shares, new issues |  |  | 0 |
Common Stock [Member] | Series D Warrants [Member] |  |  |  |
Stockholders' Equity Note |  |  |  |
Stock issued during period, shares, new issues |  |  | 0 |
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] | Maximum [Member] | B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member] |  |  |  |
Stockholders' Equity Note |  |  |  |
Aggregate offering price | $ 50,000,000 |  |  |
At Market Issuance Sales Agreement [Member] | Common Stock [Member] | B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member] |  |  |  |
Stockholders' Equity Note |  |  |  |
Stock issued during period, shares, new issues |  |  | 0 |
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 |  |

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