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Inventories (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Inventories [Abstract]    
Raw materials $ 2,392,731 $ 1,822,614
Work in progress 4,106,837 1,911,656
Finished goods 2,635,764 2,238,854
Total $ 9,135,332 $ 5,973,124