Condensed consolidated balance sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Class A Common Stock
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	17,354,683	17,330,464
Common stock, shares outstanding	17,354,683	17,330,464
Class B Common Stock
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	5,400,000	5,400,000
Common stock, shares outstanding	5,400,000	5,400,000