CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net loss	$ (20,501)	$ (3,460)	$ (37,477)	$ (14,201)
Other comprehensive loss:
Net unrealized losses on available-for-sale securities, net of taxes	(33)		(33)
Comprehensive loss	$ (20,534)	$ (3,460)	$ (37,510)	$ (14,201)