Warrants to purchase common stock outstanding - Stockholders' (Deficiency)/Equity (Details) (USD $)	12 Months Ended
	Jul. 31, 2014
Number of Shares To be Purchased	257,331,254
Warrant Expiration Date 15 December 2014
Number of Shares To be Purchased	8,470,661
Warrant Exercise Price per Share	$ 0.76
Warrant Expiration Date	Dec. 15, 2014
Warrant Expiration Date 4 February 2015
Warrant Exercise Price per Share	$ 0.79
Warrant Expiration Date	Feb. 04, 2015
Warrant Expiration Date 9 February 2015
Number of Shares To be Purchased	300,000
Warrant Exercise Price per Share	$ 0.39
Warrant Expiration Date	Feb. 09, 2015
Warrant Expiration Date 7 March 2015
Number of Shares To be Purchased	200,000
Warrant Exercise Price per Share	$ 1.25
Warrant Expiration Date	Mar. 07, 2015
Warrant Expiration Date 15 March 2015
Number of Shares To be Purchased	5,157,813
Warrant Exercise Price per Share	$ 1.00
Warrant Expiration Date	Mar. 15, 2015
Warrant Expiration Date 31 March 2016
Warrant Exercise Price per Share	$ 0.03
Warrant Expiration Date	Mar. 31, 2016
Warrant Expiration Date 11 July 2016
Warrant Exercise Price per Share	$ 0.03
Warrant Expiration Date	Jul. 11, 2016
Warrant Expiration Date 30 September 2016
Warrant Exercise Price per Share	$ 0.03
Warrant Expiration Date	Sep. 30, 2016
Warrant Expiration Date 1 February 2017
Warrant Exercise Price per Share	$ 0.03
Warrant Expiration Date	Feb. 01, 2017
Warrant Expiration Date 10 August 2017
Warrant Exercise Price per Share	$ 0.03
Warrant Expiration Date	Aug. 10, 2017
Warrant Expiration Date 12 December 2017
Number of Shares To be Purchased	8,324,144
Warrant Exercise Price per Share	$ 0.03
Warrant Expiration Date	Dec. 12, 2017
Warrant Expiration Date 17 June 2018
Warrant Exercise Price per Share	$ 0.03
Warrant Expiration Date	Jun. 17, 2018
Warrant Expiration Date 12 December 2017
Number of Shares To be Purchased	25,666,668
Warrant Exercise Price per Share	$ 0.03
Warrant Expiration Date	Jan. 15, 2019
Warrant Expiration Date 12 December 2017
Number of Shares To be Purchased	69,166,667
Warrant Exercise Price per Share	$ 0.03
Warrant Expiration Date	Mar. 27, 2019