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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
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, 2020 and December 31, 2019 were as follows:

 

   September 30,  December 31,
   2020  2019
Raw materials and sub-assemblies   $3,661,671   $3,767,588 
Finished goods    398,282    241,681 
Inventory reserves    (697,639   (830,361
Inventory, net   $3,362,314  $3,178,908