Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Balance, Beginning	$ 2,521	$ 3,462
Additions	0	0
Amortization	(932)	(941)
Balance, Ending	1,589	2,521
Patents and Other Intangible Asset [Member]
Balance, Beginning	1,764	2,048
Additions	0	0
Amortization	(275)	(284)
Balance, Ending	1,489	1,764
Weighted-average remaining amortization period in years	5 years 3 months 18 days
Proprietary Software [Member]
Balance, Beginning	757	1,414
Additions	0	0
Amortization	(657)	(657)
Balance, Ending	$ 100	$ 757
Weighted-average remaining amortization period in years	1 month 6 days