Consolidated Statements Of Operations (USD $)	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011
Consolidated Statements Of Operations [Abstract]
Net product sales	$ 812,000	$ 454,000
License fees	0	10,000
Total revenue	812,000	464,000
Operating costs and expenses
Cost of goods sold	264,000	131,000
Selling, general and administrative	7,439,000	6,520,000
Research and development	1,863,000	2,180,000
Total operating costs and expenses	9,566,000	8,831,000
Loss from operations	(8,754,000)	(8,367,000)
Other income (expense)
Change in derivative liability	11,000	0
Interest expense	(145,000)	0
Interest income	1,000	8,000
Other (expense) income, net	(3,000)	10,000
Total other (expense) income	(136,000)	18,000
Net loss	$ (8,890,000)	$ (8,349,000)
Basic and diluted net loss per share	$ (1.58)	$ (1.79)
Shares used in computing basic and diluted net loss per share	5,623,453	4,665,371