Stockholders' Deficiency - Allocation of initial proceeds (Details)	12 Months Ended
	Jul. 31, 2017 USD ($)
Series F Convertible Preferred Stock
Net proceeds	$ 2,020,000
Derivative warrant liability fair value	(2,016,065)
Derivative additional investment rights fair value	(863,735)
Other issuance costs (finders' fee)	(166,000)
Make whole payments liability	(560,250)
Deemed dividend	(1,586,050)
Series G Convertible Preferred Stock
Net proceeds	475,000
Derivative warrant liability fair value	(354,535)
Derivative additional investment rights fair value	(285,048)
Other issuance costs (finders' fee)	(40,000)
Make whole payments liability	(135,000)
Deemed dividend	$ (339,583)