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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Revenue [Line Items] |  |  |  |
Revenue | $ 7,735 | $ 6,357 | $ 14,773 | $ 12,091
North and South America [Member] |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 3,640 | 4,003 | 7,164 | 7,355
Asia (including Middle East) and Australia [Member] |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,797 | 1,580 | 4,023 | 2,996
Europe and Africa [Member] |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 2,298 | 774 | 3,586 | 1,740
Audio conferencing [Member] |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 3,096 | 2,648 | 5,931 | 5,435
Microphones [Member] |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 3,218 | 1,891 | 5,568 | 4,034
Video products [Member] |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | $ 1,421 | $ 1,818 | $ 3,274 | $ 2,622

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