Fair Value Assumptions Used in Accounting for Derivative Additional Investment Rights Liability - Derivative Liabilities (Details 2) (USD $)	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jun. 04, 2013	Mar. 05, 2013	Feb. 05, 2013	Jun. 06, 2012
Current exercise price of warrants	$ 0.03	$ 0.03
Time to expiration	3 years 6 months 18 days	3 years 6 months
Risk-free interest rate	1.02%	0.49%
Estimated volatility	80.00%	85.00%
Dividend	0.00%	0.00%
Stock price	$ 0.021	$ 0.035	$ 0.0325	$ 0.034	$ 0.038	$ 0.0925
Additional Investment Rights
Underlying number of units of convertible preferred stock	2,075	1,225
Underlying number of warrants	69,166,667	40,833,335
Current exercise price of warrants	$ 0.03	$ 0.03
Current conversion price of preferred stock	$ 0.03	$ 0.03
Time to expiration	7 months 24 days	10 months 17 days
Risk-free interest rate	0.09%	0.11%
Estimated volatility	61.00%	114.00%
Dividend	0.00%	0.00%
Stock price	$ 0.021	$ 0.035