Condensed Conslidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Statement of Income and Comprehensive Income [Abstract]
Net income (loss)	$ 7,355	$ (6,132)	$ (3,208)	$ (15,282)
Other comprehensive income:
Foreign currency translation gain (loss)	2	0	(5)	(3)
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during period	4	(8)	103	28
Other comprehensive income (loss)	6	(8)	98	25
Comprehensive income (loss)	$ 7,361	$ (6,140)	$ (3,110)	$ (15,257)