Stock-Based Compensation - Schedule of Share-based Compensation Related to Restricted Stock Awards and Stock Options (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
General and administrative expense, continuing operations	$ 14,869	$ 2,042
General and administrative expense, discontinued operations	1,118	1,100
General and administrative expense, continuing operations and discontinued operations	15,987	3,142
Research and development expense, continuing operations	1,758
Total stock-based compensation expense	$ 17,745	$ 3,142