Statements Of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statements Of Comprehensive Loss
Net loss	$ (105,717)	$ (116,772)	$ (51,145)
Other comprehensive loss:
Unrealized loss on available for sale securities, net of tax	(408)	(65)
Other comprehensive loss	(408)	(65)
Comprehensive loss	$ (106,125)	$ (116,837)	$ (51,145)