Consolidated Statements of Comprehensive 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
Net loss	$ (2,704)	$ (2,938)	$ (6,317)	$ (10,015)
Other comprehensive (loss) / income:
Unrealized (loss) / gain on securities	(163)	(35)	(186)	5
Other comprehensive (loss) / income	(163)	(35)	(186)	5
Total comprehensive loss	$ (2,867)	$ (2,973)	$ (6,503)	$ (10,010)