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Inventories (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Schedule of Inventory [Line Items]    
Finished products $ 5,202,608us-gaap_InventoryFinishedGoodsNetOfReserves $ 2,930,753us-gaap_InventoryFinishedGoodsNetOfReserves
Production materials 777,849us-gaap_InventoryRawMaterialsNetOfReserves 1,024,762us-gaap_InventoryRawMaterialsNetOfReserves
Total inventories $ 5,980,457us-gaap_InventoryNet $ 3,955,515us-gaap_InventoryNet