Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Operating activities
Net loss	$ (1,873,000)	$ (1,692,000)	$ (5,735,000)	$ (6,058,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	136,000	579,000	2,337,000	1,975,000
Amortization of stock issued for services			31,000	115,000
Depreciation and amortization			191,000	213,000
Interest expense on promissory note			1,000
Change in fair value of derivative liability				(459,000)
Inducement to exercise warrants	960,000		960,000	876,000
Gain on inventory recovery				(19,000)
Changes in operating assets and liabilities:
Accounts receivable			141,000	105,000
Inventories			2,000	17,000
Prepaid expenses			(1,000)	60,000
Accounts payable and accrued liabilities			(255,000)	(52,000)
Deferred rent			(6,000)	4,000
Net cash used in operating activities			(2,334,000)	(3,223,000)
Investing activities
Investment in patents			(4,000)	(12,000)
Purchases of property, plant and equipment			(6,000)	(19,000)
Net cash used in investing activities			(10,000)	(31,000)
Financing activities
Net proceeds from the sale of common stock			993,000
Net proceeds from the exercise of warrants			840,000	2,632,000
Net cash provided by financing activities			1,833,000	2,632,000
Net decrease in cash, cash equivalents, and restricted cash			(511,000)	(622,000)
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	415,000	1,093,000	415,000	1,093,000
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	340,000	1,018,000	340,000	1,018,000
Restricted cash	75,000	75,000	75,000	75,000
Total cash, cash equivalents and restricted cash	$ 415,000	$ 1,093,000	415,000	1,093,000
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