Condensed Consolidated Statements Of Cash Flows (USD $)	9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Condensed Consolidated Statements Of Cash Flows [Abstract]
Net loss	$ (5,512,000)	$ (6,383,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	583,000	841,000
Troubled debt restructuring loss	25,000	0
Amortization of stock issued for services	184,000	59,000
Depreciation and amortization	236,000	299,000
Amortization of deferred financing costs	215,000	0
Change in fair value of derivative liability	(270,000)	0
Amortization of debt discount	371,000	0
Changes in operating assets and liabilities:
Accounts receivable	71,000	(143,000)
Inventories	80,000	(40,000)
Prepaid expenses	(2,000)	47,000
Accounts payable and accrued liabilities	487,000	1,349,000
Deferred rent	12,000	(3,000)
Net cash used in operating activities	(3,520,000)	(3,974,000)
Investing activities
Investment in patents	(191,000)	(189,000)
Purchases of property, plant and equipment	(12,000)	(9,000)
Net cash used in investing activities	(203,000)	(198,000)
Financing activities
Net proceeds from the sale of common stock	4,611,000	2,667,000
Payment of Bridge Loan	(1,333,000)	0
Payment on note payable	(22,000)	0
Net cash provided by financing activities	3,256,000	2,667,000
Net increase (decrease) in cash and cash equivalents	(467,000)	(1,505,000)
Cash and cash equivalents at beginning of period	877,000	1,794,000
Cash and cash equivalents at end of period	410,000	289,000
Supplemental disclosure of cash flow information
Cash paid for interest	22,000	0
Cash paid for taxes	0	5,000
Supplemental disclosure of non-cash investing and financing activities
Common stock issued for prepaid services	160,000	142,000
Common stock issued under stock purchase agreement	$ 0	$ 296,000