Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net loss	$ (34,918)	$ (39,677)	$ (106,754)	$ (117,275)
Other comprehensive income (loss), net:
Change in unrealized gain/loss on available-for-sale securities	16	(154)	206	(206)
Foreign currency translation adjustment	(8,305)	(4,878)	(12,560)	(2,668)
Other comprehensive income (loss)	(8,289)	(5,032)	(12,354)	(2,874)
Total comprehensive loss	$ (43,207)	$ (44,709)	$ (119,108)	$ (120,149)