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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue [Line Items]
Revenue	$ 7,735	$ 6,357	$ 14,773	$ 12,091
North and South America [Member]
Revenue [Line Items]
Revenue	3,640	4,003	7,164	7,355
Asia (including Middle East) and Australia [Member]
Revenue [Line Items]
Revenue	1,797	1,580	4,023	2,996
Europe and Africa [Member]
Revenue [Line Items]
Revenue	2,298	774	3,586	1,740
Audio conferencing [Member]
Revenue [Line Items]
Revenue	3,096	2,648	5,931	5,435
Microphones [Member]
Revenue [Line Items]
Revenue	3,218	1,891	5,568	4,034
Video products [Member]
Revenue [Line Items]
Revenue	$ 1,421	$ 1,818	$ 3,274	$ 2,622

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