Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Operating activities
Net loss	$ (2,566,000)	$ (2,339,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	1,744,000	656,000
Amortization of stock issued for services	19,000	39,000
Depreciation and amortization	71,000	71,000
Interest expense on promissory note	1,000
Change in fair value of derivative liability		(459,000)
Inducement to exercise warrants		876,000
Changes in operating assets and liabilities:
Accounts receivable	(78,000)	154,000
Inventories	(12,000)	(1,000)
Prepaid expenses	(32,000)	11,000
Accounts payable and accrued liabilities	(206,000)	(38,000)
Deferred rent	(1,000)	(1,000)
Net cash used in operating activities	(1,060,000)	(1,031,000)
Investing activities
Investment in patents		(3,000)
Purchases of property, plant and equipment	(8,000)	(9,000)
Net cash used in investing activities	(8,000)	(12,000)
Financing activities
Net proceeds from the sale of common stock	993,000
Net proceeds from the exercise of warrants		2,632,000
Net cash provided by financing activities	993,000	2,632,000
Net (decrease) increase in cash, cash equivalents, and restricted cash	(75,000)	1,589,000
Cash, cash equivalents, and restricted cash at beginning of period	926,000	1,715,000
Cash, cash equivalents, and restricted cash at end of period	851,000	3,304,000
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	776,000	3,229,000
Restricted cash	75,000	75,000
Total cash, cash equivalents and restricted cash	851,000	1,715,000
Supplemental disclosure of non-cash financing activities
Warrant liabilities removed due to settlements		1,394,000
Common stock issued for prepaid services		51,000
Conversion of promissory note and accrued interest from a related party to common stock	$ 504,000