Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (22,118)	$ (19,667)	$ (46,349)	$ (41,673)
Other comprehensive loss:
Cumulative foreign currency translation adjustment	(10)		(1)
Unrealized loss on cash flow hedge	(258)		(205)
Comprehensive loss	$ (22,386)	$ (19,667)	$ (46,555)	$ (41,673)