Other Assets, Net (Schedule Of Other Assets, Net) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other Assets [Line Items]
Other assets, net	$ 6,055	$ 3,427
Self-Fitting Software [Member]
Other Assets [Line Items]
Other assets, net	3,679
Technology Access [Member]
Other Assets [Line Items]
Other assets, net	1,866	2,259
Other Assets [Member]
Other Assets [Line Items]
Other assets, net	$ 510	$ 1,168