Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net loss	$ (3,376)	$ (3,367)
Other comprehensive income:
Unrealized gain (loss) on investments, net of tax	(603)	42
Unrealized loss on currency translation	(1)	(3)
Other comprehensive income (loss)	(604)	39
Comprehensive loss	$ (3,980)	$ (3,328)