Loss Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2012		Oct. 31, 2011		Oct. 31, 2010		Jan. 13, 2011
Numerator [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (11,519)	$ (10,010)	$ (8,363)	$ (6,014)	$ (7,129)	$ (7,830)	$ (20,008)	$ (11,007)	$ (35,906)		$ (45,974)		$ (56,326)
Net Income (Loss) Attributable to Noncontrolling Interest									411		261		663
Adjustment for Modification of Redeemable Preferred Stock of Subsidiary									0		(8,987)		0
Dividends, Preferred Stock	(800)	(800)	(801)	(800)	(800)	(800)	(800)	(800)	(3,201)		(3,200)		(3,201)
Net loss to common shareholders	$ (12,138)	$ (10,722)	$ (9,093)	$ (6,743)	$ (7,865)	$ (8,554)	$ (29,743)	$ (11,738)	$ (38,696)		$ (57,900)		$ (58,864)
Demoninator [Abstract]
Weighted Average Number of Shares Outstanding, Basic									165,471,261		124,498,073		93,925,863
Weighted Average Number Diluted Shares Outstanding Adjustment									0	[1]	0	[1]	0	[1]
Weighted Average Number of Shares Outstanding, Diluted									165,471,261		124,498,073		93,925,863
Earnings Per Share, Basic									$ (0.23)		$ (0.47)		$ (0.63)
Earnings Per Share, Diluted									$ (0.23)	[1]	$ (0.47)	[1]	$ (0.63)	[1]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	3,120,456				3,320,558				3,120,456		3,320,558		5,100,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights								10,200,000
Class of Warrant or Right, Exercise Price of Warrants or Rights	2.29								2.29						2.29

[1] Due to the net loss to common shareholders in each of the years presented above, diluted earnings per share was computed without consideration to potentially dilutive instruments as their inclusion would have been antidilutive. Potentially dilutive instruments include stock options, warrants and convertible preferred stock. At October 31, 2012, 2011 and 2010, there were options to purchase 3.1 million, 3.3 million and 5.1 million shares of common stock, respectively. On January 13, 2011 we issued 10.2 million warrants in connection with a registered direct offering. Each warrant was exercisable for 1 share of common stock. The warrants had an exercise price of $2.29 per share and were exercisable beginning six months and one day after the initial closing date and expired in the fourth quarter of 2012.