Combined Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2015	Dec. 31, 2014
Class A common stock
Common stock, par value per share (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized shares	600,000,000	600,000,000
Common stock, issued shares	55,122,895	51,431,872
Common stock, outstanding shares	55,122,895	51,431,872
Class B common stock
Common stock, authorized shares	100,000,000	100,000,000
Common stock, issued shares	44,227,923	47,647,023
Common stock, outstanding shares	44,227,923	47,647,023
Common stock, no par value (in dollars per share)	$ 0.001	$ 0.001