Changes in value of derivative warrant liability - Derivative Liabilities (Details) - USD ($)	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Balance - Derivative warrant liability Value	$ 2,363,415
No. of Warrants - Derivative warrant liability	512,911,037
Exercise of Warrants		$ (2,194,496)
Warrants Exercised		(76,732,020)
Decrease in fair value of derivative warrant liability	$ (2,737,840)	$ (3,362,497)
August 2013
Balance - Derivative warrant liability Value		$ 5,234,293
No. of Warrants - Derivative warrant liability		220,687,537
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
July 2014
Balance - Derivative warrant liability Value	$ 2,635,643
No. of Warrants - Derivative warrant liability	239,788,852
June 2015
Additional warrants issued	$ 354,535
Warrants Issued	33,333,333
Price Protection
Additional warrants issued		$ 2,111,077
Warrants Issued		239,788,852