Promissory Note (Narrative II) (Details) (USD $)	0 Months Ended		3 Months Ended	9 Months Ended
	Apr. 24, 2013	Apr. 17, 2013	Apr. 30, 2013	Apr. 30, 2013	Apr. 30, 2012	Apr. 17, 2012
Class of Warrant or Right [Line Items]
Exercise price of warrants						0.65
Fair value of warrants	$ 100,000	$ 119,000
Dividend yield	0.00%	0.00%		0.00%	0.00%
Volatility rate	140.75%	140.63%		134.80%	81.59%
Risk-free interest rate	0.43%	0.44%		0.85%	1.17%
Expected life				5 years 22 days	4 years 9 months 26 days
Troubled debt restructuring loss				25,000	0
Amount paid under terms of the note			22,000	22,000
Morrison And Foerster L.L.P. [Member]
Class of Warrant or Right [Line Items]
Number of warrants to purchase common stock			375,000	375,000
Exercise price of warrants			0.83	0.83
Date from which warrants are exercisable				Jan. 25, 2013
Fair value of warrants			$ 245,000	$ 245,000
Dividend yield				0.00%
Volatility rate				134.00%
Risk-free interest rate				0.35%
Expected life				5 years