Condensed Consolidated Balance Sheets (USD $)	Apr. 30, 2013	Jul. 31, 2012
Assets
Cash and cash equivalents	$ 410,000	$ 877,000
Accounts receivable, net	29,000	373,000
Inventories, net	781,000	654,000
Prepaid expenses	110,000	347,000
Total current assets	1,330,000	2,251,000
Property, plant and equipment, net	171,000	257,000
Patents, net	2,004,000	1,950,000
Total assets	3,505,000	4,458,000
Liabilities and stockholders' equity
Accounts payable	848,000	1,946,000
Loan payable, net	0	962,000
Deferred revenue	0	66,000
Note payable, current	231,000	0
Accrued liabilities	411,000	344,000
Derivative liability	49,000	319,000
Total current liabilities	1,539,000	3,637,000
Note payable, less current portion	1,045,000	0
Deferred rent	15,000	3,000
Total liabilities	2,599,000	3,640,000
Commitments and contingencies
Stockholders' equity
Preferred stock, $0.01 par value: 5,000,000 shares authorized, no shares issued	0	0
Common stock, $0.01 par value: 100,000,000 shares authorized 12,236,170 issued and outstanding at April 30, 2013, and 6,644,555 issued and outstanding at July 31, 2012	123,000	67,000
Additional paid-in capital	68,795,000	63,251,000
Accumulated deficit	(68,012,000)	(62,500,000)
Total stockholders' equity	906,000	818,000
Total liabilities and stockholders' equity	$ 3,505,000	$ 4,458,000