Condensed Conslidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net (loss)	$ (13,504)	$ (18,735)	$ (36,267)
Unrealized gains (losses) on securities:
Unrealized holding (losses) gains arising during period	3	107	(102)
Reclassification for recognized gain (loss) on marketable investment securities during the period	4	4	0
Net unrealized (loss) gain on marketable investment securities	7	111	(102)
Foreign currency translation (loss) gain	44	(10)	5
Other comprehensive income	51	101	(97)
Comprehensive loss	$ (13,453)	$ (18,634)	$ (36,364)