Fair Value Assumptions Used in Accounting for Derivative Additional Investment Rights Liability - Derivative Liabilities (Details 2) - $ / shares	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Current exercise price of warrants	$ 0.015	$ 0.03
Time to expiration	2 years 6 months	2 years 4 months
Risk-free interest rate	1.08%	1.02%
Estimated volatility	82.00%	80.00%
Dividend	0.00%	0.00%
Stock price	$ 0.01	$ 0.21
Additional Investment Rights
Underlying number of units of convertible preferred stock	500	2,075
Underlying number of warrants	33,333,333	69,166,667
Current exercise price of warrants	$ 0.015	$ .03
Current conversion price of preferred stock	$ 0.015	$ .03
Time to expiration	1 year 18 days	7 months 24 days
Risk-free interest rate	30.00%	0.09%
Estimated volatility	79.00%	61.00%
Dividend	0.00%	0.00%
Stock price	$ 0.01	$ 0.021