Balance Sheet Details (Schedule of Patents) (Details) - USD ($)	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Balance Sheet Details [Abstract]
Patents	$ 3,508,000	$ 3,482,000
Less accumulated amortization	(2,316,000)	(2,137,000)
Patents, net	1,192,000	1,345,000
Impairment of patents	0	0
Patent Amortization Expense	$ 179,000	$ 177,000
Weighted Average Remaining Amortization Period For Patents	7 years
Amortization expense, Next twelve months	$ 170,000
Amortization expenses, Year two	180,000
Amortization expenses, Year three	180,000
Amortization expenses, Year four	180,000
Amortization expenses, Year five	$ 180,000