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Revenue Information - Revenue into Primary Product Groups and Major Regions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue [Line Items]
Revenue	$ 3,622	$ 4,178
North and South America [Member]
Revenue [Line Items]
Revenue	1,094	1,570
Asia Pacific (includes Middle East, India and Australia)
Revenue [Line Items]
Revenue	2,000	1,696
Europe and Africa [Member]
Revenue [Line Items]
Revenue	528	912
Audio conferencing [Member]
Revenue [Line Items]
Revenue	1,523	2,329
Microphones [Member]
Revenue [Line Items]
Revenue	1,571	1,195
Video products [Member]
Revenue [Line Items]
Revenue	$ 528	$ 654

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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