Consolidated Statements Of Operations (USD $)	3 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Consolidated Statements Of Operations [Abstract]
Net product sales	$ 110,000	$ 257,000
Operating costs and expenses
Cost of goods sold	31,000	129,000
Selling, general and administrative	1,476,000	1,997,000
Research and development	395,000	493,000
Total operating costs and expenses	1,902,000	2,619,000
Loss from operations	(1,792,000)	(2,362,000)
Other income (expense)
Change in derivative liability	228,000	0
Interest expense	(588,000)	0
Interest income	0	1,000
Other (expense) income, net	(2,000)	0
Total other (expense) income	(362,000)	1,000
Net loss	$ (2,154,000)	$ (2,361,000)
Basic and diluted net loss per share	$ (0.25)	$ (0.47)
Shares used in computing basic and diluted net loss per share	8,720,980	5,044,950