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Inventory Components (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials and sub-assemblies $ 3,016,327 $ 2,665,185
Finished goods 67,120 64,359
Inventory reserves (885,181) (1,192,105)
Inventories, net $ 2,198,266 $ 1,537,439