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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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue [Line Items]
Revenue	$ 2,504	$ 4,889	$ 8,430	$ 14,550
North and South America [Member]
Revenue [Line Items]
Revenue	932	2,400	3,236	7,353
Asia Pacific (includes Middle East, India and Australia)
Revenue [Line Items]
Revenue	1,358	2,058	4,200	5,426
Europe and Africa [Member]
Revenue [Line Items]
Revenue	214	431	994	1,771
Audio conferencing [Member]
Revenue [Line Items]
Revenue	929	1,867	3,357	6,484
Microphones [Member]
Revenue [Line Items]
Revenue	1,172	2,355	3,786	6,239
Video products [Member]
Revenue [Line Items]
Revenue	$ 403	$ 667	$ 1,287	$ 1,827

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