CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
Net loss	$ (47,603)	$ (58,215)	$ (90,078)	$ (118,233)
Other comprehensive income (loss):
Net unrealized gain (loss) on marketable securities	(7)	20	107	20
Comprehensive loss	$ (47,610)	$ (58,195)	$ (89,971)	$ (118,213)