Consolidated Statements Of Operations (USD $)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Consolidated Statements Of Operations [Abstract]
Net product sales	$ 820,000	$ 812,000
Operating costs and expenses
Cost of goods sold	565,000	264,000
Selling, general and administrative	5,718,000	7,439,000
Research and development	1,325,000	1,863,000
Impairment of patents	551,000	0
Total operating costs and expenses	8,159,000	9,566,000
Loss from operations	(7,339,000)	(8,754,000)
Other income (expense)
Change in derivative liability	268,000	11,000
Interest expense	(593,000)	(144,000)
Other (expense) income, net	(7,000)	(3,000)
Total other (expense) income	(332,000)	(136,000)
Net loss	$ (7,671,000)	$ (8,890,000)
Basic and diluted net loss per share	$ (0.71)	$ (1.58)
Shares used in computing basic and diluted net loss per share	10,838,140	5,623,453