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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Preferred stock, par value $ 0.0001 $ 0.0001
Preferred stock, authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.00005 $ 0.00005
Common stock, authorized 100,000,000 100,000,000
Common stock, shares issued 23,101,710 22,957,818
Treasury stock, shares 333,300 0