CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net loss	$ (21,743)	$ (6,352)	$ (32,003)	$ (11,710)
Other comprehensive loss, net of tax:
Net change in unrealized gain (loss) on available-for-sale investments	(7)	(10)	(8)	(21)
Foreign currency translation gain	123		320
Comprehensive loss	$ (21,627)	$ (6,362)	$ (31,691)	$ (11,731)