Commitments and Contingencies (Details) (USD $)	1 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Oct. 08, 2009 patent
Loss Contingencies [Line Items]
Number of Patent Infringements Alleged					2
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2013	$ 655,000	$ 655,000
2014	474,000	474,000
2015 and thereafter	0	0
Total	1,129,000	1,129,000
Cash paid for legal settlement	5,000,000.0	16,000	24,000	51,000
Settlement cost		$ 5,000,000	$ 0	$ 0