Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts receivable, allowance for doubtful accounts	$ 3,378	$ 2,811
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	30,000,000	30,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Class A Common Stock
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	1,245,000,000	600,000,000
Common stock, shares issued	53,299,111	34,578,393
Common stock, shares outstanding	53,299,111	34,578,393
Class B Common Stock
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	15,000,000	15,000,000
Common stock, shares issued	6,217,447	6,217,447
Common stock, shares outstanding	6,217,447	6,217,447
Class C Capital Stock
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	600,000,000	0
Common stock, shares issued	118,958,359	81,591,680
Common stock, shares outstanding	118,958,359	81,591,680