Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net loss	$ (48,196)	$ (13,713)	$ (65,124)	$ (34,591)
Other comprehensive income (loss):
Unrealized gain on investments, net of tax	5	602	15	540
Unrealized gain (loss) on currency translation	2	(2)	1	(2)
Other comprehensive income	7	600	16	538
Comprehensive loss	$ (48,189)	$ (13,113)	$ (65,108)	$ (34,053)