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Inventories (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 901,600 $ 1,074,156
Finished goods 125,932 112,535
Work in process 16,848
Valuation allowance (643,616) (504,583)
Inventory, net $ 400,764 $ 682,108