Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Future Minimum Lease Payments [Abstract]
2013	$ 1,022,000
2014	742,000
2015	347,000
2016	43,000
2017	0
Total	2,154,000
Rent expense under operating leases	1,100,000	1,200,000	1,100,000
Open purchase orders	18,000,000
Letters of credit outstanding	$ 325,000