Condensed Consolidated Statements Of Operations (USD $)	3 Months Ended		6 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Condensed Consolidated Statements Of Operations [Abstract]
Net product sales	$ 273,000	$ 41,000	$ 390,000	$ 156,000
Operating costs and expenses
Cost of goods sold	111,000	20,000	156,000	56,000
Selling, general and administrative	1,201,000	1,243,000	2,524,000	2,168,000
Research and development	215,000	289,000	391,000	502,000
Share-based compensation	482,000	1,332,000	985,000	1,421,000
Other share-based expenses		308,000		308,000
Restructuring costs		70,000		2,754,000
Total operating costs and expenses	2,009,000	3,262,000	4,056,000	7,209,000
Loss from operations	(1,736,000)	(3,221,000)	(3,666,000)	(7,053,000)
Other income (expense)
Change in derivative liability	5,000	(1,000)	4,000	(59,000)
Interest expense, net	(3,000)	(2,000)	(5,000)	(5,000)
Gain on extinguishment of debt		727,000		727,000
Other income (expense), net	(2,000)	15,000	(3,000)	64,000
Total other income (expense)		739,000	(4,000)	727,000
Net loss	$ (1,736,000)	$ (2,482,000)	$ (3,670,000)	$ (6,326,000)
Basic and diluted net loss per share	$ (0.04)	$ (0.10)	$ (0.10)	$ (0.28)
Shares used in computing basic and diluted net loss per share	39,851,590	24,997,773	38,440,396	22,842,753