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Inventories (Tables)
3 Months Ended
Mar. 31, 2016
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 March 31, 2016 and December 31, 2015 were as follows:

 

   March 31,  December 31,
   2016  2015
Raw materials and sub-assemblies  $2,654,686   $2,521,585 
Finished goods   77,339    39,083 
Inventory reserves   (1,221,255)   (1,234,578)
Inventories, net  $1,510,770  $1,326,090