Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net loss	$ (539,215)	$ (443,790)	$ (120,635)
Change in net unrealized loss on available-for-sale investments, net of tax	(1,784)	(441)	0
Comprehensive loss	$ (540,999)	$ (444,231)	$ (120,635)