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Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of inventories

Inventories consist of the following:

   March 31, 2021   December 31, 2020 
         
Raw materials   $3,883   $2,825 
Finished goods    1,148    1,545 
    5,031    4,370 
Allowance for excess inventory quantities    (30)   (30)
   $5,001   $4,340