Condensed Consolidated Statements Of Operations (USD $)	3 Months Ended		9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Condensed Consolidated Statements Of Operations [Abstract]
Net product sales	$ 258,000	$ 207,000	$ 631,000	$ 685,000
Operating costs and expenses
Cost of goods sold	67,000	37,000	155,000	206,000
Selling, general and administrative	1,464,000	1,557,000	4,550,000	5,439,000
Research and development	304,000	439,000	1,105,000	1,421,000
Total operating costs and expenses	1,835,000	2,033,000	5,810,000	7,066,000
Loss from operations	(1,577,000)	(1,826,000)	(5,179,000)	(6,381,000)
Other income (expense)
Change in derivative liability	30,000	0	270,000	0
Interest expense	(2,000)	0	(591,000)	0
Interest income	0	0	0	1,000
Other (expense) income, net	15,000	(3,000)	(12,000)	(3,000)
Total other (expense) income	43,000	(3,000)	(333,000)	(2,000)
Net loss	$ (1,534,000)	$ (1,829,000)	$ (5,512,000)	$ (6,383,000)
Basic and diluted net loss per share	$ (0.14)	$ (0.31)	$ (0.53)	$ (1.18)
Shares used in computing basic and diluted net loss per share	11,255,833	5,838,466	10,310,721	5,400,685