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Segment Information (Tables)
12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Summary of revenue by geographic region
  Year ended December 31, 
   2018   2017 
   (in thousands) 
         
North America  $3,389   $4,057 
Asia   478    942 
Europe   11    45 
           
Total revenue  $3,878   $5,044 
Summary of sales by product type
   Year ended December 31, 
   2018   2017 
   (in thousands) 
     
Optical  $3,781   $4,615 
Wafer       9 
Core   41    26 
Research & development   56    394 
           
Total revenue  $3,878   $5,044 
Summary of assets by geographic region
   As of December 31, 
   2018   2017 
   (in thousands) 
     
United States  $30,680   $30,037 
Malaysia   5,110    5,007 
Other   4    4 
Total assets  $35,794   $35,048