Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Income Statement [Abstract]
Net product sales	$ 590,000	$ 464,000
Operating costs and expenses
Cost of goods sold	203,000	146,000
Selling, general and administrative	1,109,000	1,445,000
Research and development	97,000	144,000
Share-based compensation	1,744,000	656,000
Total operating costs and expenses	3,153,000	2,391,000
Loss from operations	(2,563,000)	(1,927,000)
Other income (expense)
Change in derivative liabilities		459,000
Inducement to exercise warrants		(876,000)
Interest expense, net	(3,000)	(1,000)
Other income, net		6,000
Total other expense	(3,000)	(412,000)
Net loss	$ (2,566,000)	$ (2,339,000)
Basic and diluted net loss per share	$ (0.04)	$ (0.04)
Shares used in computing basic and diluted net loss per share	71,002,302	64,964,404