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