Revenue, Net (Schedule Of Net Revenue By Market) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenue, Major Customer [Line Items]
Total Net Revenue	$ 21,503	$ 29,570	$ 29,570
Cost of goods sold	16,931	21,012
Products and Services Transferred at Point in Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	6,965	8,777
Products and Services Transferred over Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	14,538	20,793
Medical, Diabetes [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	13,530	17,164
Medical, Diabetes [Member] | Products and Services Transferred over Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	13,530	17,164
Medical, Other Medical [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	2,828	3,629
Medical, Other Medical [Member] | Scenario, Adjustment [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	(1,200)
Cost of goods sold	(800)
Medical, Other Medical [Member] | Products and Services Transferred at Point in Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	1,820
Medical, Other Medical [Member] | Products and Services Transferred over Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	1,008	3,629
Hearing Health Value Based DTEC [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	1,173	1,630
Hearing Health Value Based DTEC [Member] | Products and Services Transferred at Point in Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	1,173	1,630
Hearing Health Value Based ITEC [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	744	2,577
Hearing Health Value Based ITEC [Member] | Products and Services Transferred at Point in Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	744	2,577
Legacy OEM [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	1,964	2,803
Legacy OEM [Member] | Products and Services Transferred at Point in Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	1,964	2,803
Professional Audio Communications [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	1,264	1,767
Professional Audio Communications [Member] | Products and Services Transferred at Point in Time [Member]
Revenue, Major Customer [Line Items]
Total Net Revenue	$ 1,264	$ 1,767