Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Preferred stock, par value (usd per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized (shares) 25,000,000 25,000,000
Preferred stock, shares issued (shares) 0 0
Preferred stock, shares outstanding (shares) 0 0
Common stock, par value (usd per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (shares) 550,000,000 550,000,000
Common stock, shares issued (shares) 0 0
Common stock, shares outstanding (shares) 0 0
Class A Common Stock [Member]
    
Common stock, par value (usd per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (shares) 500,000,000 500,000,000
Common stock, shares issued (shares) 26,002,000 23,181,000
Common stock, shares outstanding (shares) 26,002,000 23,181,000
Class B Common Stock [Member]
    
Common stock, par value (usd per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (shares) 500,000,000 500,000,000
Common stock, shares issued (shares) 8,786,000 9,673,000
Common stock, shares outstanding (shares) 8,786,000 9,673,000