Summary of Significant Accounting Policies (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Comprehensive income (loss)
Beginning Balance			$ (50)
Unrealized gain (loss) on investments		4	42	(18)	(42)
Unrealized gain (loss) on currency translation	(1)	(1)	(4)	(2)	2
Ending Balance	$ (12)	$ (10)	$ (12)	$ (10)	$ (50)