Consolidated Statements Of Operations (USD $)	3 Months Ended		9 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011
Consolidated Statements Of Operations [Abstract]
Net product sales	$ 207,000	$ 128,000	$ 685,000	$ 210,000
License fees	0	0	0	10,000
Total revenue	207,000	128,000	685,000	220,000
Operating costs and expenses
Cost of goods sold	37,000	37,000	206,000	62,000
Selling, general and administrative	1,557,000	1,437,000	5,439,000	4,847,000
Research and development	439,000	473,000	1,421,000	1,647,000
Total operating costs and expenses	2,033,000	1,947,000	7,066,000	6,556,000
Loss from operations	(1,826,000)	(1,819,000)	(6,381,000)	(6,336,000)
Other income (expense)
Interest income	0	1,000	1,000	6,000
Other income, net	(3,000)	0	(3,000)	12,000
Total other income (expense)	(3,000)	1,000	(2,000)	18,000
Net loss	$ (1,829,000)	$ (1,818,000)	$ (6,383,000)	$ (6,318,000)
Basic and diluted net loss per share	$ (0.04)	$ (0.05)	$ (0.15)	$ (0.17)
Shares used in computing basic and diluted net loss per share	46,708,185	37,276,199	43,209,474	36,662,054