Revenue Information - Revenue into Primary Product Groups and Major Regions (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenue [Line Items]
Revenue	$ 1,916	$ 2,304	$ 4,229	$ 5,926
North and South America [Member]
Revenue [Line Items]
Revenue	1,331	1,210	2,291	2,304
Asia Pacific (includes Middle East, India and Australia)
Revenue [Line Items]
Revenue	230	841	1,418	2,842
Europe and Africa [Member]
Revenue [Line Items]
Revenue	355	253	520	780
Audio conferencing [Member]
Revenue [Line Items]
Revenue	625	905	1,579	2,429
Microphones [Member]
Revenue [Line Items]
Revenue	971	1,043	2,089	2,614
Video products [Member]
Revenue [Line Items]
Revenue	$ 320	$ 356	$ 561	$ 883

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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+ Details