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Inventory - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Non-current inventory $ 5,080,643us-gaap_InventoryNoncurrent $ 5,110,967us-gaap_InventoryNoncurrent
Inventory valuation reserve $ 151,922us-gaap_InventoryWriteDown