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Revenue Information - Revenue into Primary Product Groups and Major Regions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue [Line Items]
Revenue	$ 6,264	$ 6,992	$ 21,184	$ 21,765
North and South America [Member]
Revenue [Line Items]
Revenue	3,251	3,419	10,211	10,583
Asia Pacific (includes Middle East, India and Australia)
Revenue [Line Items]
Revenue	2,018	2,130	6,560	6,153
Europe and Africa [Member]
Revenue [Line Items]
Revenue	995	1,443	4,413	5,029
Audio conferencing [Member]
Revenue [Line Items]
Revenue	3,201	2,916	9,655	8,847
Microphones [Member]
Revenue [Line Items]
Revenue	2,475	2,659	8,525	8,227
Video products [Member]
Revenue [Line Items]
Revenue	$ 588	$ 1,417	$ 3,004	$ 4,691

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