Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Income Statement [Abstract]
Net product sales	$ 464,000	$ 531,000
Operating costs and expenses
Cost of goods sold	146,000	265,000
Selling, general and administrative	1,445,000	1,337,000
Research and development	144,000	248,000
Share-based compensation	656,000	278,000
Total operating costs and expenses	2,391,000	2,128,000
Loss from operations	(1,927,000)	(1,597,000)
Other income (expense)
Change in derivative liabilities	459,000	(159,000)
Inducement to exercise warrants	(876,000)
Interest expense, net	(1,000)	(1,000)
Other income, net	6,000	14,000
Total other expense	(412,000)	(146,000)
Net loss	$ (2,339,000)	$ (1,743,000)
Basic and diluted net loss per share	$ (0.04)	$ (0.03)
Shares used in computing basic and diluted net loss per share	64,964,404	64,823,917