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Benefit Plans - Summary of Stock Option Activity (Details)	12 Months Ended
	Oct. 31, 2018 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options, Shares, Outstanding, Beginning Balance | shares	309,950
Options, Shares, Granted | shares	54,503
Options, Shares, Canceled | shares	(40,967)
Options, Shares, Outstanding, Ending Balance | shares	323,486
Weighted-Average Option Price, Outstanding, Beginning Balance | $ / shares	$ 23.81
Weighted-Average Option Price, Granted | $ / shares	1.78
Weighted-Average Option Price, Canceled | $ / shares	100.85
Weighted-Average Option Price, Outstanding, Ending Balance | $ / shares	$ 10.34

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(4)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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