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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories

Inventories consist of the following:

 

    March 31, 2020     December 31, 2019  
Raw materials   $ 1,423     $ 1,425  
Finished goods     991       1,170  
      2,414       2,595  
Allowance for excess inventory quantities     (30 )     (41 )
    $ 2,384     $ 2,554