Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			6 Months Ended
	Dec. 14, 2017	May 03, 2017	Apr. 30, 2018	Oct. 31, 2017
Stockholders' Equity Note
Common stock, shares authorized			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	11,580,900
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
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
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
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