Derivative Liabilities - Derivative warrant liability (Details) (USD $)	9 Months Ended	12 Months Ended
	Apr. 30, 2014	Jul. 31, 2013
Balance - Derivative warrant liability Value		$ 4,081,627
No. of Warrants - Derivative warrant liability		55,148,530
Exercise of Warrants	(2,194,496)	(5,629,130)
Warrants Exercised	(76,732,020)	(145,888,421)
Increase/decrease in fair value of derivative warrant liability	(298,370)	(3,279,650)
Balance - Derivative warrant liability Value	5,699,770	5,234,293
No. of Warrants - Derivative warrant liability	239,788,852	220,687,537
August 2012
Additional warrants issued		624,797
Warrants Issued		9,375,000
December 2012
Additional warrants issued		762,355
Warrants Issued		24,999,999
June 2013
Additional warrants issued		1,189,744
Warrants Issued		40,833,335
Price Protection
Additional warrants issued		7,484,550
Warrants Issued		236,219,094
January 2014
Additional warrants issued	942,279
Warrants Issued	26,666,668
March 2014
Additional warrants issued	$ 2,016,064
Warrants Issued	69,166,667