Revenue By Market (Schedule Of Net Revenue By Market) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Total Revenue	$ 11,479	$ 14,943	$ 25,605	$ 30,296
Medical [Member]
Segment Reporting Information [Line Items]
Total Revenue	4,890	6,183	12,014	12,287
Hearing Health [Member]
Segment Reporting Information [Line Items]
Total Revenue	4,989	6,201	10,227	13,774
Professional Audio Communications [Member]
Segment Reporting Information [Line Items]
Total Revenue	$ 1,600	$ 2,559	$ 3,364	$ 4,235