CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (26,254)	$ (21,482)	$ (53,425)	$ (40,650)
Other comprehensive loss, before tax:
Net change in unrealized (loss) gain on available-for-sale investments	(14)	(8)	116	32
Foreign currency translation gain (loss)	64	203	797	(238)
Net change in unrealized loss on derivative instruments	(2,886)	0	(277)	0
Other comprehensive loss, before tax	(2,836)	195	636	(206)
Tax effect	(234)	0	(234)	0
Other comprehensive loss, net of tax	(3,070)	195	402	(206)
Comprehensive loss	$ (29,324)	$ (21,287)	$ (53,023)	$ (40,856)