CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net loss	$ (279,966)	$ (156,937)	$ (82,947)
Other comprehensive income (loss):
Net unrealized gains (losses) on marketable securities available-for-sale	54	42	(65)
Reclassification adjustment for gains included in net loss	0	0	(615)
Foreign currency translation adjustment	(2,744)	(2,561)	(6,764)
Other comprehensive loss	(2,690)	(2,519)	(7,444)
Comprehensive loss	$ (282,656)	$ (159,456)	$ (90,391)