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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended		6 Months Ended
	Apr. 30, 2019	Feb. 21, 2019	Jun. 13, 2018	May 03, 2017	Apr. 30, 2019	Jan. 31, 2019	Apr. 30, 2019	Oct. 31, 2018
Stockholders' Equity Note
Stock issued during period value, new issues						$ 90
Exchange Agreement [Member]
Stockholders' Equity Note
Common stock issued to warrant holders		500,000
Series C Warrants [Member]
Stockholders' Equity Note
Class of Warrant or Right, Outstanding	964,114				964,114		964,114	964,114
Series A Warrants [Member]
Stockholders' Equity Note
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 69.96				$ 69.96		$ 69.96
Class of Warrant or Right, Outstanding	640,000				640,000		640,000
Series A Warrant [Member]
Stockholders' Equity Note
Class of Warrant or Right, Outstanding								640,000
Fair value of the warrant pre-modification					$ 3,169		$ 3,169
Series A Warrant [Member] | Exchange Agreement [Member]
Stockholders' Equity Note
Fair value of the warrant pre-modification					300		300
Fair value of the shares at the date of the Exchange Agreement					$ 3,500		$ 3,500
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
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
Stock issued during period value, new issues	$ 8,000
At Market Issuance Sales Agreement [Member] | Common Stock [Member] | Maximum [Member] | B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member]
Stockholders' Equity Note
Stock to be sold in future during period value new issues	$ 42,000
Underwritten Public Offering [Member]
Stockholders' Equity Note
Stock issued during period, shares, new issues				1,000,000
Underwritten Public Offering [Member] | Series C Warrants [Member]
Stockholders' Equity Note
Class of warrants or rights issued				1,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 19.20
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				1,000,000

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