Summary of Revenue by Product (Details) - USD ($)	3 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Product Information [Line Items]
Revenue, net	$ 497,000	$ 1,417,000
Pure Hard Surface [Member]
Product Information [Line Items]
Revenue, net	444,000	1,379,000
Sil Verion [Member]
Product Information [Line Items]
Revenue, net	$ 53,000	$ 38,000