Promissory Note (Narrative II) (Details) (USD $)	1 Months Ended			12 Months Ended
	Apr. 17, 2013	Apr. 24, 2013	Jun. 29, 2012	Jul. 31, 2013	Jul. 31, 2012
Class of Warrant or Right [Line Items]
Exercise Price			$ 3.52
Dividend yield			0.00%	0.00%	0.00%
Volatility rate	140.63%	140.75%	82.44%	134.80%	85.41%
Risk-free interest rate			0.24%	0.85%	0.75%
Expected life				5 years 22 days	4 years
Troubled debt restructuring loss				$ 25,000	$ 0
Payment on note payable				43,000	0
Accrued interest				174,000
Morrison And Foerster Llp [Member]
Class of Warrant or Right [Line Items]
Number of warrants to purchase common stock				375,000
Exercise Price				$ 0.83
Fair value of warrants				$ 245,000
Dividend yield				0.00%
Volatility rate				134.00%
Risk-free interest rate				0.35%
Expected life				5 years