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Revenue Information - Revenue into Primary Product Groups and Major Regions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue [Line Items]
Revenue	$ 7,038	$ 5,734
North and South America [Member]
Revenue [Line Items]
Revenue	3,524	3,352
Asia (including Middle East) and Australia [Member]
Revenue [Line Items]
Revenue	2,226	1,416
Europe and Africa [Member]
Revenue [Line Items]
Revenue	1,288	966
Audio conferencing [Member]
Revenue [Line Items]
Revenue	2,835	2,787
Microphones [Member]
Revenue [Line Items]
Revenue	2,350	2,143
Video products [Member]
Revenue [Line Items]
Revenue	$ 1,853	$ 804

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