Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net loss	$ (77,830)	$ (43,993)	$ (30,351)
Other comprehensive income (loss):
Unrealized gain (loss) on investments, net of taxes	10	(9)	(863)
Unrealized loss on currency translation		(4)	(2)
Reclassification of unrealized gain included in net loss	0	388
Other comprehensive income (loss)	10	375	(865)
Comprehensive loss	$ (77,820)	$ (43,618)	$ (31,216)