Basis of Presentation and Significant Accounting Policies (Details) (Series E Preferred Stock, USD $)	0 Months Ended	1 Months Ended
	May 24, 2011 item	Oct. 31, 2012
Series E Preferred Stock
Derivative Liabilities
Number of investors with whom the Purchase Agreement is entered into	8
Number of shares sold pursuant to the Purchase Agreement	8,700	1,000
Purchase price of shares sold pursuant to the Purchase Agreement (in dollars per share)	$ 1,000
Purchase price of shares sold pursuant to the Purchase Agreement	$ 8,700,000	$ 1,000,000