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Inventory Components (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials and sub-assemblies $ 3,118,418 $ 2,785,154
Finished goods 145,076 335,335
Inventory reserves (868,161) (848,161)
Inventories, net $ 2,395,333 $ 2,272,328