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Revenue Information - Revenue into Primary Product Groups and Major Regions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue [Line Items]
Revenue	$ 7,375	$ 7,735	$ 14,920	$ 14,773
North and South America [Member]
Revenue [Line Items]
Revenue	3,184	3,640	6,960	7,164
Asia Pacific (includes Middle East, India and Australia)
Revenue [Line Items]
Revenue	2,468	1,797	4,542	4,023
Europe and Africa [Member]
Revenue [Line Items]
Revenue	1,723	2,298	3,418	3,586
Audio conferencing [Member]
Revenue [Line Items]
Revenue	3,277	3,096	6,453	5,931
Microphones [Member]
Revenue [Line Items]
Revenue	3,123	3,218	6,051	5,568
Video products [Member]
Revenue [Line Items]
Revenue	$ 975	$ 1,421	$ 2,416	$ 3,274

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