Benefit Plans 5 (Details) (USD $)	12 Months Ended			3 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010	Jul. 31, 2012 Employee Stock Purchase Plan [Member]	Jan. 31, 2012 Employee Stock Purchase Plan [Member]	Oct. 31, 2012 Employee Stock Purchase Plan [Member]	Nov. 02, 2011 Employee Stock Purchase Plan [Member]	Oct. 31, 2011 Employee Stock Purchase Plan [Member]
Employee Stock Purchase Plan Disclosures [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	5,000,000					774,373		998,060
Stock Issuance Terms						85.00%	85.00%
Weighted Average Expented Life Assumption for Employee Stock Purchase Plan	0 years 6 months	0 years 6 months	0 years 6 months
Weighted Average Risk Free Interest Rate for Employee Stock Purchase Plan	0.70%	0.20%	0.20%
Volatility for Employee Stock Purchase Plan	92.00%	90.50%	94.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0.87
Stock Issued During Period, Shares, Employee Stock Purchase Plans				(131,019)	(92,668)
Weighted Average Dividend Yield for Employee Stock Purchase Plan	0.00%	0.00%	0.00%