Convertible Note and Derivative Liability (Narrative) (Details)	12 Months Ended
	Jul. 31, 2015 USD ($) shares	Jul. 31, 2014 USD ($) shares	Jul. 31, 2012 USD ($) item	Oct. 31, 2014 shares	Aug. 29, 2014 shares	Jul. 31, 2013 USD ($)	Jan. 25, 2013 USD ($)	Jun. 26, 2012 shares
Convertible Note And Derivative Liability [Line Items]
Aggregate cash consideration received | $			$ 1,200,000
Number of lenders | item			9
Number of warrants to purchase common stock					4,652,313
Warrants value | $	$ 4,000	$ 9,000
Aggregate number of exercises	413,332
Decrease in derivative liability | $	$ 5,000	$ (55,000)
Common stock, shares issued	41,859,297	29,394,940		13,470,324
Warrants outstanding	5,035,156
Warrants liability | $	$ 4,000	$ 9,000				$ 51,000
Warrant [Member]
Convertible Note And Derivative Liability [Line Items]
Number of warrants to purchase common stock		518,000
Common stock, shares issued		100,662
Change in fair value of derivative liability | $	$ (5,000)	$ 55,000
Notes [Member]
Convertible Note And Derivative Liability [Line Items]
Unsecured note principal amount | $			$ 1,333,000				$ 1,125,000
Bridge Loan [Member]
Convertible Note And Derivative Liability [Line Items]
Common stock, shares issued		100,662
Warrants outstanding	9,709
Bridge Loan [Member] | Warrant [Member]
Convertible Note And Derivative Liability [Line Items]
Number of warrants to purchase common stock		122,711						132,420