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Segment Information (Tables)
9 Months Ended
Sep. 30, 2021
Segment Reporting [Abstract]  
Schedule of geographic region
    Three months ended
September 30,
    Nine months ended
September 30,
 
    2021     2020     2021     2020  
    (in thousands)     (in thousands)  
                         
North America   $ 1,247     $ 788     $ 2,356     $ 2,628  
Asia     49       91       258       359  
Other     6       13       32       21  
Total revenue   $ 1,302     $ 892     $ 2,646     $ 3,008  

  

Schedule of sales by product type
    Three months ended
September 30,
    Nine months ended
September 30,
 
    2021     2020     2021     2020  
    (in thousands)     (in thousands)  
                   
Optical   $ 1,302     $ 892     $ 2,646     $ 3,008