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Revenue Information - Revenue into Primary Product Groups and Major Regions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue [Line Items]
Revenue	$ 4,178	$ 7,545
North and South America [Member]
Revenue [Line Items]
Revenue	1,570	3,776
Asia Pacific (includes Middle East, India and Australia)
Revenue [Line Items]
Revenue	1,696	2,074
Europe and Africa [Member]
Revenue [Line Items]
Revenue	912	1,695
Audio conferencing [Member]
Revenue [Line Items]
Revenue	2,329	3,176
Microphones [Member]
Revenue [Line Items]
Revenue	1,195	2,928
Video products [Member]
Revenue [Line Items]
Revenue	$ 654	$ 1,441

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