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Segment Information (Tables)
12 Months Ended
Dec. 31, 2019
Segment Reporting [Abstract]  
Summary of revenue by geographic region
  Year ended December 31, 
   2019   2018 
   (in thousands) 
         
North America  $3,324   $3,389 
Asia   185    478 
Other   17    11 
           
Total revenue  $3,526   $3,878 
Summary of sales by product type
  Year ended December 31, 
   2019   2018 
   (in thousands) 
     
Optical  $3,338   $3,781 
Core   9    41 
Research & development       56 
Rubicon DTP   179     
           
Total revenue  $3,526   $3,878 
Summary of assets by geographic region
  As of December 31, 
   2019   2018 
   (in thousands) 
     
United States  $29,703   $30,680 
Malaysia   5,094    5,110 
Other   4    4 
Total assets  $34,801   $35,794