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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue [Line Items]
Revenue	$ 8,412	$ 5,992	$ 20,503	$ 18,717
North and South America [Member]
Revenue [Line Items]
Revenue	6,215	3,235	13,570	10,488
Asia (including Middle East) and Australia [Member]
Revenue [Line Items]
Revenue	1,149	1,931	4,145	5,764
Europe and Africa [Member]
Revenue [Line Items]
Revenue	1,048	826	2,788	2,465
Audio conferencing [Member]
Revenue [Line Items]
Revenue	2,766	2,920	8,201	8,520
Microphones [Member]
Revenue [Line Items]
Revenue	2,435	2,189	6,469	6,525
Video products [Member]
Revenue [Line Items]
Revenue	$ 3,211	$ 883	$ 5,833	$ 3,672

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