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Segment Information (Tables)
6 Months Ended
Jun. 30, 2021
Segment Reporting [Abstract]  
Schedule of geographic region
   Three months ended
June 30,
   Six months ended
June 30,
 
   2021   2020   2021   2020 
   (in thousands)   (in thousands) 
                 
North America  $890   $1,135   $1,478   $2,175 
Asia   70    154    209    268 
Other   24    
    26    7 
Total revenue  $984   $1,289   $1,713   $2,450 

 

Schedule of sales by product type
   Three months ended
June 30,
   Six months ended
June 30,
 
   2021   2020   2021   2020 
   (in thousands)   (in thousands) 
             
Optical  $848   $1,089   $1,343   $2,117 
Direct Dose Rx (discontinued operations)   136    200    370    333 
Total revenue  $984   $1,289   $1,713   $2,450