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Segment Information (Tables)
12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Summary of revenue by geographic region
   Year ended
December 31,
 
   2020   2019 
   (in thousands) 
         
North America  $4,039   $3,324 
Asia   406    185 
Other   22    17 
           
Total revenue  $4,467   $3,526 
Summary of sales by product type
   Year ended
December 31,
 
   2020   2019 
   (in thousands) 
     
Optical  $3,611   $3,338 
Core   6    9 
Rubicon DTP   850    179 
           
Total revenue  $4,467   $3,526 
Summary of assets by geographic region
   As of
December 31,
 
   2020   2019 
   (in thousands) 
     
United States  $31,240   $29,703 
Malaysia       5,094 
Other       4 
Total assets  $31,240   $34,801