Other Accrued Liabilities (Components Of Other Accrued Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Other Accrued Liabilities [Abstract]
Pension	$ 120	$ 120
Postretirement benefit obligation	71	71
Accrued stock compensation	400
Deferred revenue	250	327
Current self-fitting software liability	253	285
Current technology access liability	989	1,236
Current earn-out contingent consideration liability	1,251
Other	1,095	830
Total	$ 4,429	$ 2,869