Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Operating activities
Net loss	$ (4,417,000)	$ (13,692,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	723,000	1,621,000
Amortization of stock issued for services	108,000	163,000
Fair value of derivative liabilities in excess of proceeds		1,867,000
Depreciation and amortization	204,000	154,000
Impairment of patents		48,000
Change in fair value of derivative liability	(153,000)	6,241,000
Changes in operating assets and liabilities:
Accounts receivable	78,000	121,000
Inventories	2,000	(113,000)
Prepaid expenses	(5,000)
Accounts payable and accrued liabilities	58,000	(125,000)
Deferred rent	9,000	(4,000)
Net cash used in operating activities	(3,393,000)	(3,719,000)
Investing activities
Investment in patents	(11,000)	(11,000)
Purchases of property, plant and equipment	(205,000)	(337,000)
Net cash used in investing activities	(216,000)	(348,000)
Financing activities
Net proceeds from the sale of common stock	1,049,000	8,000,000
Net proceeds from the exercise of warrants	80,000	151,000
Net cash provided by financing activities	1,129,000	8,151,000
Net (decrease) increase in cash and cash equivalents	(2,480,000)	4,084,000
Cash and cash equivalents at beginning of period	5,194,000	1,321,000
Cash and cash equivalents at end of period	2,714,000	5,405,000
Supplemental disclosure of cash flow information
Cash paid for taxes	2,000	2,000
Warrant liabilities removed due to settlements	8,000	6,310,000
Restricted stock unit cancelation	38,000
Common stock issued for prepaid services		$ 288,000