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
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
Net loss	$ (8,254)	$ (15,953)	$ (29,098)	$ (53,018)
Other comprehensive income (loss):
Net unrealized gain (loss) on available-for-sale securities	1	10	(52)	4
Foreign currency translation adjustments				16
Reclassification of foreign currency translation adjustments		153		153
Other comprehensive income (loss)	1	163	(52)	173
Comprehensive loss	$ (8,253)	$ (15,790)	$ (29,150)	$ (52,845)