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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2015
Dec. 31, 2014
CONDENSED CONSOLIDATED BALANCE SHEETS    
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized 90,000,000 90,000,000
Common stock, shares issued 51,665,821 51,561,396
Common stock, shares outstanding 51,665,821 51,561,396