Stockholders' Equity (Summary Of Warrants Outstanding) (Details)	12 Months Ended
	Jul. 31, 2015 $ / shares shares
Promissory Note [Line Items]
Class of Warrant or Right, Outstanding	5,035,156
01/13/16 [Member]
Promissory Note [Line Items]
Investment Warrants, Exercise Price | $ / shares	$ 3.52
Class of Warrant or Right, Outstanding	81,280
06/26/16 [Member]
Promissory Note [Line Items]
Investment Warrants, Exercise Price | $ / shares	$ 0.50
Class of Warrant or Right, Outstanding	41,667
07/10/16 [Member]
Promissory Note [Line Items]
Investment Warrants, Exercise Price | $ / shares	$ 0.50
Class of Warrant or Right, Outstanding	50,000
12/14/16 [Member]
Promissory Note [Line Items]
Investment Warrants, Exercise Price | $ / shares	$ 3.61
Class of Warrant or Right, Outstanding	25,000
12/24/16 [Member]
Promissory Note [Line Items]
Investment Warrants, Exercise Price | $ / shares	$ 0.20
Class of Warrant or Right, Outstanding	9,709
02/24/17 [Member]
Promissory Note [Line Items]
Investment Warrants, Exercise Price | $ / shares	$ 1.00
Class of Warrant or Right, Outstanding	100,000
09/17/17 [Member]
Promissory Note [Line Items]
Investment Warrants, Exercise Price | $ / shares	$ 1.38
Class of Warrant or Right, Outstanding	113,520
01/24/18 [Member]
Promissory Note [Line Items]
Investment Warrants, Exercise Price | $ / shares	$ 0.83
Class of Warrant or Right, Outstanding	375,000
08/29/19 [Member]
Promissory Note [Line Items]
Investment Warrants, Exercise Price | $ / shares	$ 0.75
Class of Warrant or Right, Outstanding	4,238,980