Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Income Statement [Abstract]
Net product sales	$ 394,000	$ 411,000	$ 984,000	$ 875,000
Operating costs and expenses
Cost of goods sold	160,000	161,000	363,000	307,000
Selling, general and administrative	1,002,000	1,418,000	2,111,000	2,863,000
Research and development	67,000	120,000	164,000	264,000
Share-based compensation	457,000	740,000	2,201,000	1,396,000
Total operating costs and expenses	1,686,000	2,439,000	4,839,000	4,830,000
Loss from operations	(1,292,000)	(2,028,000)	(3,855,000)	(3,955,000)
Other income (expense)
Inducement to exercise warrants				(876,000)
Change in derivative liabilities				459,000
Interest expense, net	(1,000)	(1,000)	(4,000)	(2,000)
Other income (expense), net	(3,000)	2,000	(3,000)	8,000
Total other income (expense)	(4,000)	1,000	(7,000)	(411,000)
Net loss	$ (1,296,000)	$ (2,027,000)	$ (3,862,000)	$ (4,366,000)
Basic and diluted net loss per share	$ (0.02)	$ (0.03)	$ (0.05)	$ (0.07)
Shares used in computing basic and diluted net loss per share	71,623,494	68,000,810	71,312,898	66,482,607