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Inventories (Tables)
9 Months Ended
Sep. 30, 2015
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, 2015 and December 31, 2014 were as follows:

 

   September 30,  December 31,
   2015  2014
Raw materials and sub-assemblies  $2,172,717   $2,153,764 
Finished goods   64,590    61,175 
Inventory reserves   (1,265,185)   (1,257,612)
Inventories, net  $972,122  $957,327