Restructuring and Impairment Charges (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Restructuring and Impairment Charges [Abstract]
Beginning restructuring liability	$ 46,000		$ 931,000
Severance and termination charges incurred					1,142,000
Severance and termination disbursements	(33,000)		(918,000)
Ending restructuring liability	$ 13,000		$ 13,000		$ 931,000