Consolidated Statements Of Cash Flows (USD $)	3 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Consolidated Statements Of Cash Flows [Abstract]
Net loss	$ (2,154,000)	$ (2,361,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	188,000	377,000
Amortization of stock issued for services	24,000	0
Depreciation and amortization	73,000	117,000
Amortization of deferred financing costs	215,000	0
Change in fair value of derivative liability	(228,000)	0
Amortization of debt discount	371,000	0
Changes in operating assets and liabilities:
Accounts receivable	36,000	(69,000)
Inventories	(3,000)	11,000
Prepaid expenses	28,000	8,000
Accounts payable and accrued liabilities	209,000	438,000
Deferred rent	0	(4,000)
Net cash used in operating activities	(1,241,000)	(1,483,000)
Investing activities
Investment in patents	(77,000)	(39,000)
Purchases of property, plant and equipment	(3,000)	0
Net cash used in investing activities	(80,000)	(39,000)
Financing activities
Net proceeds from the sale of common stock	4,227,000	720,000
Payment of Bridge Loan	(1,333,000)	0
Net cash provided by financing activities	2,894,000	720,000
Net increase (decrease) in cash and cash equivalents	1,573,000	(802,000)
Cash and cash equivalents at beginning of period	877,000	1,794,000
Cash and cash equivalents at end of period	2,450,000	992,000
Supplemental disclosure of cash flow information
Cash paid for taxes	0	1,000
Supplemental disclosure of non-cash investing and financing activities
Common stock issued for prepaid services	$ 0	$ 97,000