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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Stockholders' equity:  
Preferred stock, par value$ 0.001$ 0.001
Preferred stock, shares authorized5,000,0005,000,000
Preferred stock, shares issued1,213,1421,213,142
Preferred stock, shares outstanding1,213,1421,213,142
Preferred stock, liquidation preference value$ 13,526,533$ 13,344,562
Common stock, par value$ 0.001$ 0.001
Common stock, shares authorized100,000,000100,000,000
Common stock, shares issued54,212,64346,564,914
Common stock, shares outstanding54,212,64346,564,914