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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
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, 2018 and December 31, 2017 were as follows:

 

   September 30,  December 31,
   2018  2017
Raw materials and sub-assemblies  $2,705,323   $3,016,327 
Finished goods   58,635    67,120 
Inventory reserves   (870,745)   (885,181)
Inventories, net  $1,893,213  $2,198,266