Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Less: Accumulated amortization	$ (1,608)	$ (1,442)
Intangible assets, net	6,377	6,543
Acquired Patents And Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 7,985	$ 7,985