Condensed Conslidated Statements of Comprehensive Income (Loss) (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 Comprehensive Income [Abstract]
Net income (loss)	$ 1,992	$ (12,389)	$ (4,584)	$ (20,185)
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during period	35	(82)	21	(73)
Reclassification for recognized gain (loss) on marketable investment securities during the period	0	(2)	7	(2)
Net unrealized gain (loss) on marketable investment securities	35	(84)	28	(75)
Foreign currency translation (loss) gain	(189)	7	(191)	9
Other comprehensive loss	(154)	(77)	(163)	(66)
Comprehensive income (loss)	$ 1,838	$ (12,466)	$ (4,747)	$ (20,251)