CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
Net loss	$ (10,696)	$ (28,161)	$ (10,233)
Other comprehensive income (loss), net of tax [Abstract]
Foreign currency translation adjustment	4,553	79	415
Unrealized (losses) gains on available-for-sale and non-marketable securities	(486)	2,271	(4,093)
Reclassification adjustment for realized gains (losses) recognized in net loss	537	(2,060)	1,003
Unrealized (losses) gains on cash flow hedges	(2,020)	826	0
Reclassification adjustment for realized gains on cash flow hedges recognized into income	1,226	0	0
Net change in other comprehensive income (loss), net of tax	3,810	1,116	(2,675)
Comprehensive loss	$ (6,886)	$ (27,045)	$ (12,908)