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Revenue Information - Revenue into Primary Product Groups and Major Regions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenue [Line Items]
Revenue	$ 2,313	$ 3,622
North and South America [Member]
Revenue [Line Items]
Revenue	960	1,094
Asia Pacific (includes Middle East, India and Australia)
Revenue [Line Items]
Revenue	1,188	2,000
Europe and Africa [Member]
Revenue [Line Items]
Revenue	165	528
Audio conferencing [Member]
Revenue [Line Items]
Revenue	953	1,523
Microphones [Member]
Revenue [Line Items]
Revenue	1,118	1,571
Video products [Member]
Revenue [Line Items]
Revenue	$ 242	$ 528

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