Acquisitions - Summary of Unaudited Pro Forma Information for Acquisition Occurred (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Business Combinations [Abstract]
Revenue	$ 205,355	$ 143,614
Net loss	(164,974)	(88,326)
Net loss attributable to common stockholders	$ (78,336)	$ (24,032)
Net loss per share attributable to common stockholders, basic and diluted	$ (3.44)	$ (1.07)