Consolidated Statements Of Cash Flows (USD $)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Consolidated Statements Of Cash Flows [Abstract]
Net loss	$ (7,671,000)	$ (8,890,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	720,000	1,077,000
Inventory reserve	347,000	0
Impairment of patents	551,000	0
Troubled debt restructuring loss	25,000	0
Amortization of stock issued for services	255,000	118,000
Depreciation and amortization	311,000	385,000
Amortization of stock issued under purchase agreement	0	296,000
Amortization of deferred financing costs	215,000	53,000
Change in fair value of derivative liability	(268,000)	(11,000)
Amortization of debt discount	371,000	91,000
Changes in operating assets and liabilities:
Accounts receivable	82,000	(323,000)
Inventories	149,000	207,000
Prepaid expenses	37,000	(9,000)
Accounts payable and accrued liabilities	962,000	1,355,000
Deferred revenue	0	66,000
Deferred rent	10,000	(3,000)
Net cash used in operating activities	(3,904,000)	(5,588,000)
Investing activities
Investment in patents	(219,000)	(239,000)
Purchases of property, plant and equipment	(12,000)	(10,000)
Net cash used in investing activities	(231,000)	(249,000)
Financing activities
Net proceeds from the sale of common stock	4,666,000	3,818,000
Net proceeds from bridge loan	0	1,200,000
Deferred financing costs	0	(98,000)
Payment of Bridge Loan	(1,333,000)	0
Payment on note payable	(43,000)	0
Net cash provided by financing activities	3,290,000	4,920,000
Net decrease in cash and cash equivalents	(845,000)	(917,000)
Cash and cash equivalents at beginning of period	877,000	1,794,000
Cash and cash equivalents at end of period	32,000	877,000
Supplemental disclosure of cash flow information
Cash paid for interest	0	0
Cash paid for taxes	1,600	5,000
Supplemental disclosure of non-cash investing and financing activities
Common stock issued for prepaid services	231,000	142,000
Common stock issued under stock purchase agreement	0	296,000
Common stock issued under Bridge Loan	0	168,000
Fair value of derivative liabilities	$ 0	$ 330,000