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Inventories (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Inventory    
Raw materials and work in process $ 2,510,870 $ 3,156,002
Consigned inventory 423,987 249,964
Finished goods 3,491,572 3,331,882
Total $ 6,426,429 $ 6,737,848