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
Statement of Comprehensive Income [Abstract]
Net loss	$ (911)	$ (6,107)	$ (11,385)	$ (21,543)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustment	(609)	1,268	(458)	(1,856)
Unrealized change in available-for-sale and non-marketable securities (net of tax of $(545) and $256 for the three and six months ended June 30, 2014, respectively)	(898)	(55)	421	(331)
Unrealized change in cash flow hedges	181	(361)	478	727
Net change in other comprehensive (loss) income, net of tax	(1,326)	852	441	(1,460)
Comprehensive loss	$ (2,237)	$ (5,255)	$ (10,944)	$ (23,003)