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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Contingently redeemable common stock:    
Contingently redeemable common stock, Issued shares 0 4,788,125
Contingently redeemable common stock, outstanding shares 0 4,788,125
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 110,267,145 102,676,544
Common Stock, outstanding shares 110,267,145 102,676,544