Intangible and Other Assets Intangible Asset Narrative (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Patents	Dec. 31, 2013 Patents	Mar. 31, 2014 Licenses	Dec. 31, 2013 Licenses
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	$ 271		$ 57	$ 62	$ 91	$ 110
Finite-lived intangible assets, accumulated amortization			884	871	57	38
Amortization of intangible assets	32	13
Pending patent	$ 123
Finite-lived intangible asset, useful life	5 years