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Segment Information (Tables)
6 Months Ended
Jun. 30, 2022
Segment Reporting [Abstract]  
Schedule of revenue by geographic region
   Three months ended
June 30,
   Six months ended
June 30,
 
   2022   2021   2022   2021 
   (in thousands)   (in thousands) 
                 
North America  $643   $754   $1,411   $1,108 
Asia   133    70    326    209 
Other   29    24    40    26 
Total revenue  $805   $848   $1,777   $1,343