Condensed Consolidated Statements Of Operations (USD $)	3 Months Ended		6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Condensed Consolidated Statements Of Operations [Abstract]
Net product sales	$ 41,000	$ 263,000	$ 156,000	$ 373,000
Operating costs and expenses
Cost of goods sold	20,000	57,000	56,000	88,000
Selling, general and administrative	1,243,000	1,427,000	2,168,000	2,763,000
Research and development	289,000	347,000	502,000	694,000
Share-based compensation	1,332,000	242,000	1,421,000	430,000
Other share-based expenses	308,000	0	308,000	0
Restructuring costs	70,000	0	2,754,000	0
Total operating costs and expenses	3,262,000	2,073,000	7,209,000	3,975,000
Loss from operations	(3,221,000)	(1,810,000)	(7,053,000)	(3,602,000)
Other income (expense)
Change in derivative liability	(1,000)	12,000	(59,000)	240,000
Interest expense, net	(2,000)	(1,000)	(5,000)	(589,000)
Gain on extinguishment of debt	727,000	0	727,000	0
Other (expense) income, net	15,000	(25,000)	64,000	(27,000)
Total other income (expense)	739,000	(14,000)	727,000	(376,000)
Net loss	$ (2,482,000)	$ (1,824,000)	$ (6,326,000)	$ (3,978,000)
Basic and diluted net loss per share	$ (0.10)	$ (0.17)	$ (0.28)	$ (0.40)
Shares used in computing basic and diluted net loss per share	24,997,773	10,986,170	22,842,753	9,853,575