Derivative Liabilities - Fair value assumptions, derivative additional investment rights liability (Details) (USD $)	6 Months Ended	12 Months Ended
	Jan. 31, 2014	Jul. 31, 2013
Current exercise price of warrants	$ 0.03	$ 0.03
Time to expiration	3 years 2 months 12 days	3 years 6 months
Risk-free interest rate	0.69%	0.49%
Estimated volatility	86.00%	85.00%
Dividend		0.00%
Stock price at period end date	$ 0.042	$ 0.035
Additional Investment Rights
Underlying number of units of convertible preferred stock	425	1,225
Underlying number of units of warrants	14,166,667	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	4 months 17 days	10 months 16 days
Risk-free interest rate	0.06%	0.11%
Estimated volatility	67.00%	114.00%
Dividend	0.00%	0.00%
Stock price at period end date	$ 0.042	$ 0.035