Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Balance Sheets [Abstract]
Allowance for doubtful accounts	$ 182,880	$ 202,160
Allowance for doubtful accounts non current	372,000	438,840
Accumulated depreciation on furniture, fixtures and equipment	446,484	426,482
Accumulated amortization of patents	344,238	294,934
Discount on notes payable	$ 3,065	$ 8,361
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	15,556,878	14,915,959
Common stock, shares to be issued	1,501,457	637,013
Common stock, shares outstanding	15,523,545	14,882,626
Treasury stock, at cost	33,333	33,333