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Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventory components

Inventories consist principally of raw materials and sub-assemblies, which are stated at the lower of cost (first-in, first-out) or market. Inventories at September 30, 2019 and December 31, 2018 were as follows:

 

   September 30,  December 31,
   2019  2018
Raw materials and sub-assemblies  $3,140,461   $2,785,154 
Finished goods   255,938    335,335 
Inventory reserves   (868,161)   (848,161)
Inventories, net  $2,528,238   $2,272,328