Stockholders' Equity - Schedule of Changes in Shares Under Options Excluding Performance Based Options (Detail) - $ / shares	12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Shares
Outstanding, beg. of year (shares)	6,817,609	8,829,618	12,325,499
Granted (shares)	9,990,000	275,000	1,045,000
Exercised (shares)	0	(1,058,416)	(2,985,792)
Canceled/Forfeited (shares)	(1,833,958)	(1,228,593)	(1,555,089)
Outstanding, end of year (shares)	14,973,651	6,817,609	8,829,618
Exercisable, end of year (shares)	5,061,984	5,696,273	6,044,792
Weighted Average Price
Outstanding, beg. of year (usd per share)	$ 4.52	$ 4.83	$ 4.49
Granted (usd per share)	0.88	8.05	6.68
Exercised (usd per share)	0.00	4.27	2.94
Canceled/Forfeited (usd per share)	5.66	7.67	7.02
Outstanding, end of year (usd per share)	1.95	4.52	4.83
Exercisable, end of year (usd per share)	$ 3.84	$ 4.24	$ 4.72