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Consolidated Balance Sheets (Parenthetical)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2012
Class A Ordinary Shares
USD ($)
Dec. 31, 2011
Class A Ordinary Shares
Dec. 31, 2012
Class B Ordinary Shares
USD ($)
Dec. 31, 2011
Class B Ordinary Shares
Common stock, par value per share $ 0.00005   $ 0.00005  
Common stock, shares authorized 825,000,000 825,000,000 35,400,000 35,400,000
Common stock, shares issued 27,202,710 27,111,117 7,763,000 7,803,000
Common stock, shares outstanding 27,202,710 27,111,117 7,763,000 7,803,000