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Consolidated Balance Sheets (Parenthetical) (USD $) | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
ASSETS |  |
Accounts receivable, less allowance for doubtful accounts | $ 7,600 | $ 7,600
Stockholders' equity: |  |
Series A Preferred stock, par value | $ 0.01 | $ 0.01
Series A Preferred stock, authorized shares | 10,000,000 | 10,000,000
Series A Preferred stock, issued shares | 0 | 0
Series A Preferred stock, outstanding shares | 0 | 0
Series B Preferred stock, issued shares | 750,000 | 750,000
Series B Preferred stock, outstanding shares | 750,000 | 750,000
Series B liquidation preference | 877,500 | 870,000
Series C Preferred stock, issued shares | 177,904 | 177,904
Series C Preferred stock, outstanding shares | 177,904 | 177,904
Series C liquidation preference | 97,847 | 97,847
Series D Preferred stock, issued shares | 1,751,005 | 1,751,005
Series D Preferred stock, outstanding shares | 1,751,005 | 1,751,005
Series D liquidation preference | $ 4,714,433 | $ 4,673,284
Common stock, par value | $ 0.01 | $ 0.01
Common stock, authorized shares | 90,000,000 | 90,000,000
Common stock, issued shares | 59,349,300 | 56,307,382
Common stock, outstanding shares | 59,349,300 | 56,307,382

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