Consolidated Statements Of Operations (USD $)	3 Months Ended		6 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2012	Jan. 31, 2011
Revenue
Net product sales	$ 221,000	$ 58,000	$ 478,000	$ 81,000
License fees	0	10,000	0	10,000
Total revenue	221,000	68,000	478,000	91,000
Operating costs and expenses
Cost of goods sold	40,000	15,000	169,000	25,000
Selling, general and administrative	1,885,000	1,876,000	3,882,000	3,410,000
Research and development	489,000	673,000	982,000	1,175,000
Total operating costs and expenses	2,414,000	2,564,000	5,033,000	4,610,000
Loss from operations	(2,193,000)	(2,496,000)	(4,555,000)	(4,519,000)
Other income (expense)
Interest income	0	3,000	1,000	5,000
Other income, net	0	13,000	0	13,000
Total other income (expense)	0	16,000	1,000	18,000
Net loss	$ (2,193,000)	$ (2,480,000)	$ (4,554,000)	$ (4,501,000)
Basic and diluted net loss per share	$ (0.05)	$ (0.07)	$ (0.11)	$ (0.12)
Shares used in computing basic and diluted net loss per share	42,625,705	37,058,057	41,498,148	36,364,995