CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net loss	$ (68,985)	$ (51,312)	$ (133,655)	$ (107,206)
Other comprehensive income (loss):
Net unrealized gains (losses) on marketable securities	(7)	14	(12)	(1)
Cumulative translation adjustment	(49)		(26)
Other comprehensive income (loss)	(56)	14	(38)	(1)
Comprehensive loss	$ (69,041)	$ (51,298)	$ (133,693)	$ (107,207)