Intangible Assets, Net (Schedule Of Intangible Assets, Net) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Less: Accumulated amortization	$ (2,772)	$ (2,107)
Intangible assets, net	5,213	5,878
Acquired Patents And Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 7,985	$ 7,985