Revenue By Market (Schedule Of Net Revenue By Market)(Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue, Major Customer [Line Items]
Total Revenue	$ 21,961	$ 16,628	$ 42,049	$ 34,692
Medical [Member]
Revenue, Major Customer [Line Items]
Total Revenue	13,393	9,179	25,064	19,018
Hearing Health [Member]
Revenue, Major Customer [Line Items]
Total Revenue	5,651	5,327	11,270	11,795
Hearing Health - Direct To Customer [Member]
Revenue, Major Customer [Line Items]
Total Revenue	1,409		2,825
Professional Audio Communications [Member]
Revenue, Major Customer [Line Items]
Total Revenue	$ 1,508	$ 2,122	$ 2,890	$ 3,879