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Revenue Information - Revenue into Primary Product Groups and Major Regions (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Revenue [Line Items] |  |  |  |
Revenue | $ 5,483 | $ 7,375 | $ 9,661 | $ 14,920
North and South America [Member] |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 3,384 | 3,184 | 4,954 | 6,960
Asia Pacific (includes Middle East, India and Australia) |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,672 | 2,468 | 3,368 | 4,542
Europe and Africa [Member] |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 427 | 1,723 | 1,339 | 3,418
Audio conferencing [Member] |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 2,289 | 3,277 | 4,618 | 6,453
Microphones [Member] |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 2,688 | 3,123 | 3,883 | 6,051
Video products [Member] |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | $ 506 | $ 975 | $ 1,160 | $ 2,416

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