Stock Based Compensation Arrangements - Schedule of Share-based Compensation Related to Restricted Stock Awards and Stock Options (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
General and administrative expense, continuing operations	$ 8,718	$ 2,464	$ 22,783	$ 10,057
General and administrative expense, discontinued operations		274		1,118
General and administrative expense, continuing operations and discontinued operations	8,718	2,738	22,783	11,175
Research and development expense, continuing operations	1,204	452	4,891	639
Total stock-based compensation expense	$ 9,922	$ 3,190	$ 27,674	$ 11,814

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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