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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Stockholders' equity:    
Convertible preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Convertible preferred stock, Authorized shares 5,000,000 5,000,000
Convertible preferred stock, Issued shares 0 0
Convertible preferred stock, outstanding shares 0 0
Common Stock, par value (in dollars per share) $ 0.001 $ 0.001
Common Stock, Authorized shares 500,000,000 500,000,000
Common Stock, Issued shares 111,525,021 110,267,145
Common Stock, outstanding shares 111,525,021 110,267,145