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Business Description, Basis of Presentation and Significant Accounting Policies - Revenue by Product Group (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenue
Revenue	$ 28,967	$ 29,069
North and South America
Revenue
Revenue	14,042	18,320
Asia (including Middle East) and Australia
Revenue
Revenue	8,197	5,998
Europe and Africa
Revenue
Revenue	6,728	4,751
Audio Conferencing
Revenue
Revenue	11,568	10,926
Microphones
Revenue
Revenue	10,963	9,149
Video products
Revenue
Revenue	$ 6,436	$ 8,994

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