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Revenue Information - Revenue into Primary Product Groups and Major Regions (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue [Line Items]        
Revenue $ 6,992 $ 8,412 $ 21,765 $ 20,503
North and South America [Member]        
Revenue [Line Items]        
Revenue 3,419 6,215 10,583 13,570
Asia (including Middle East) and Australia [Member]        
Revenue [Line Items]        
Revenue 2,130 1,149 6,153 4,145
Europe and Africa [Member]        
Revenue [Line Items]        
Revenue 1,443 1,048 5,029 2,788
Audio conferencing [Member]        
Revenue [Line Items]        
Revenue 2,916 2,766 8,847 8,201
Microphones [Member]        
Revenue [Line Items]        
Revenue 2,659 2,435 8,227 6,469
Video products [Member]        
Revenue [Line Items]        
Revenue $ 1,417 $ 3,211 $ 4,691 $ 5,833