Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2011

Commitments and Contingencies [Abstract]

Amount accrued

	Years Ended December 31,
	2011		2010
Beginning Balance	$	1,105	$	589
Accruals		2,230		516
Payments		—		—
Ending Balance	$	3,335	$	1,105