Condensed Consolidated Statements Of Operations - USD ($)	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Condensed Consolidated Statements Of Operations [Abstract]
Net product sales	$ 729,000	$ 550,000
Operating costs and expenses
Cost of goods sold	285,000	344,000
Selling, general and administrative	4,912,000	5,056,000
Research and development	790,000	1,032,000
Share-based compensation	2,382,000	2,958,000
Other share-based expenses		308,000
Restructuring costs		2,754,000
Total operating costs and expenses	8,369,000	12,452,000
Loss from operations	(7,640,000)	(11,902,000)
Other income (expense)
Change in derivative liability	5,000	(55,000)
Interest expense, net	(8,000)	(10,000)
Gain on extinguishment of debt		727,000
Other income (expense), net	16,000	190,000
Total other income (expense)	13,000	852,000
Net loss	$ (7,627,000)	$ (11,050,000)
Basic and diluted net loss per share	$ (0.19)	$ (0.43)
Shares used in computing basic and diluted net loss per share	39,748,935	25,609,548