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	$ (24,295)	$ (2,346)	$ (33,616)	$ (27,908)
Other comprehensive (loss) income, net of income tax:
Unrealized gain on available-for-sale securities	1,149	1,806	2,510	2,585
Foreign currency translation adjustments	(315)	106	158	(1,900)
Other comprehensive income	834	1,912	2,668	685
Total comprehensive loss	$ (23,461)	$ (434)	$ (30,948)	$ (27,223)