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Inventories (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Inventory    
Raw materials and work in process $ 2,642,543 $ 3,156,002
Consigned inventory 418,829 249,964
Finished goods 3,600,153 3,331,882
Total $ 6,661,525 $ 6,737,848