Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (35,051)	$ 567	$ (61,582)	$ (42,309)
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on marketable securities	(61)	75	159	75
Foreign currency translation adjustments	520	0	1,030	0
Comprehensive income (loss)	$ (34,592)	$ 642	$ (60,393)	$ (42,234)