Combined Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Treasury stock, shares (in shares)	548,861	0
Class A common stock
Common stock, par value per share (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized shares (in shares)	600,000,000	600,000,000
Common stock, issued shares (in shares)	55,758,710	51,471,579
Common stock, outstanding shares (in shares)	55,209,849	51,431,872
Class B common stock
Common stock, no par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized shares (in shares)	100,000,000	100,000,000
Common stock, issued shares (in shares)	44,055,987	47,647,023
Common stock, outstanding shares (in shares)	44,055,987	47,647,023