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Segment Information (Tables)
9 Months Ended
Sep. 30, 2022
Segment Reporting [Abstract]  
Schedule of revenue by geographic region
   Three months ended
September 30,
   Nine months ended
September 30,
 
   2022   2021   2022   2021 
   (in thousands)   (in thousands) 
                 
North America  $625   $1,247   $2,036   $2,356 
Asia   56    49    382    258 
Other   10    6    50    32 
Total revenue  $691   $1,302   $2,468   $2,646