Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015
Condensed Consolidated Statements of Operations [Abstract]
Net product sales	$ 176,000	$ 273,000	$ 362,000	$ 390,000
Operating costs and expenses
Cost of goods sold	48,000	111,000	102,000	156,000
Selling, general and administrative	1,386,000	1,201,000	2,472,000	2,524,000
Research and development	238,000	215,000	474,000	391,000
Share-based compensation	763,000	482,000	1,435,000	985,000
Total operating costs and expenses	2,435,000	2,009,000	4,483,000	4,056,000
Loss from operations	(2,259,000)	(1,736,000)	(4,121,000)	(3,666,000)
Other income (expense)
Fair value of derivative liabilities in excess of proceeds	(859,000)		(1,867,000)
Change in derivative liability	(7,790,000)	5,000	(7,747,000)	4,000
Interest expense, net	(3,000)	(3,000)	(5,000)	(5,000)
Other income (expense), net	9,000	(2,000)	18,000	(3,000)
Total other income (expense)	(8,643,000)		(9,601,000)	(4,000)
Net loss	$ (10,902,000)	$ (1,736,000)	$ (13,722,000)	$ (3,670,000)
Basic and diluted net loss per share	$ (0.19)	$ (0.04)	$ (0.27)	$ (0.10)
Shares used in computing basic and diluted net loss per share	58,678,242	39,851,590	50,848,785	38,440,396