Revenue By Market (Schedule Of Net Revenue By Market) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue, Major Customer [Line Items]
Total Net Revenue	$ 27,367	$ 26,893	$ 72,472	$ 85,800
Products and Services Transferred at Point in Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	11,691	7,794	26,501	25,016
Products and Services Transferred over Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	15,676	19,099	45,971	60,784
Medical, Diabetes [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	14,518	15,723	41,569	50,837
Medical, Diabetes [Member] | Products and Services Transferred over Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	14,518	15,723	41,569	50,837
Medical, Other Medical [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	6,131	3,376	13,556	9,947
Medical, Other Medical [Member] | Products and Services Transferred at Point in Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	4,973		9,154
Medical, Other Medical [Member] | Products and Services Transferred over Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	1,158	3,376	4,402	9,947
Hearing Health Value Based DTEC [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	953	1,510	3,513	4,876
Hearing Health Value Based DTEC [Member] | Products and Services Transferred at Point in Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	953	1,510	3,513	4,876
Hearing Health Value Based ITEC [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	1,779	2,443	3,888	7,419
Hearing Health Value Based ITEC [Member] | Products and Services Transferred at Point in Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	1,779	2,443	3,888	7,419
Hearing Health Legacy OEM [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	2,759	2,405	6,444	7,749
Hearing Health Legacy OEM [Member] | Products and Services Transferred at Point in Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	2,759	2,405	6,444	7,749
Professional Audio Communications [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	1,227	1,436	3,502	4,972
Professional Audio Communications [Member] | Products and Services Transferred at Point in Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	$ 1,227	$ 1,436	$ 3,502	$ 4,972