CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net loss	$ (16,327)	$ (10,696)	$ (28,161)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	2,410	4,553	79
Unrealized change in available-for-sale and non-marketable securities	476	51	211
Unrealized change in cash flow hedges	(796)	(794)	826
Net change in other comprehensive income (loss), net of tax	2,090	3,810	1,116
Comprehensive loss	$ (14,237)	$ (6,886)	$ (27,045)