Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Income Statement [Abstract]
Net product sales	$ 398,000	$ 590,000
Operating costs and expenses
Cost of goods sold	156,000	203,000
Selling, general and administrative	1,290,000	2,853,000
Research and development	82,000	97,000
Total operating costs and expenses	1,528,000	3,153,000
Loss from operations	(1,130,000)	(2,563,000)
Other income (expense)
Interest expense, net	(2,000)	(3,000)
Other income, net	7,000
Total other income (expense)	5,000	(3,000)
Net loss	$ (1,125,000)	$ (2,566,000)
Basic and diluted net loss per share	$ (0.01)	$ (0.04)
Shares used in computing basic and diluted net loss per share	78,004,073	71,002,302