Consolidated Statements Of Operations (USD $)	3 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Consolidated Statements Of Operations [Abstract]
Net product sales	$ 257,000	$ 23,000
Operating costs and expenses
Cost of goods sold	129,000	10,000
Selling, general and administrative	1,997,000	1,535,000
Research and development	493,000	502,000
Total operating costs and expenses	2,619,000	2,047,000
Loss from operations	(2,362,000)	(2,024,000)
Other income (expense)
Interest income	1,000	2,000
Total other income (expense)	1,000	2,000
Net loss	$ (2,361,000)	$ (2,022,000)
Basic and diluted net loss per share	$ (0.06)	$ (0.06)
Shares used in computing basic and diluted net loss per share	40,370,592	35,671,933