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Segment Information (Tables)
3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Schedule of geographic region
   Three months ended
March 31,
 
   2021   2020 
   (in thousands) 
         
North America  $588   $1,040 
Asia   139    113 
Other   2    7 
Total revenue  $729   $1,160 
Schedule of sales by product type
   Three months ended
March 31,
 
   2021   2020 
   (in thousands) 
     
Optical  $495   $1,027 
Rubicon DTP   234    133 
Total revenue  $729   $1,160