Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Operating activities
Net loss	$ (1,296,000)	$ (2,027,000)	$ (3,862,000)	$ (4,366,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	457,000	740,000	2,201,000	1,396,000
Amortization of stock issued for services			25,000	142,000
Depreciation and amortization			143,000	81,000
Interest expense on promissory note			1,000
Change in fair value of derivative liability				(459,000)
Inducement to exercise warrants				876,000
Inventory write-off				26,000
Changes in operating assets and liabilities:
Accounts receivable			146,000	151,000
Inventories			(8,000)	(20,000)
Prepaid expenses			(16,000)	41,000
Accounts payable and accrued liabilities			(128,000)	7,000
Deferred rent			(3,000)	6,000
Net cash used in operating activities			(1,501,000)	(2,119,000)
Investing activities
Investment in patents				(4,000)
Purchases of property, plant and equipment			(8,000)	(20,000)
Net cash used in investing activities			(8,000)	(24,000)
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			(516,000)	489,000
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	410,000	2,204,000	410,000	2,204,000
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	335,000	2,129,000	335,000	2,129,000
Restricted cash	75,000	75,000	75,000	75,000
Total cash, cash equivalents and restricted cash	$ 410,000	$ 2,204,000	410,000	2,204,000
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