Condensed Consolidated Statements of Comprehensive (Loss) Income (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 Income And Comprehensive Income [Abstract]
Net (loss) income	$ 1,330	$ (1,360)	$ 2,334	$ (7,167)
Other comprehensive income (loss):
Net unrealized (losses) gains on marketable securities, net of tax	(15)	(49)	6	(68)
Net translation gains (losses)	19	318	(116)	(1,196)
Total other comprehensive income (loss)	4	269	(110)	(1,264)
Comprehensive (loss) income	$ 1,334	$ (1,091)	$ 2,224	$ (8,431)