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Inventories (Components Of Inventories) (Detail) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Inventory Disclosure [Line Items]    
Raw materials $ 3,718,539 $ 3,839,230
Work in process 135,430 191,781
Finished goods 27,042,947 21,524,523
Total inventories $ 30,896,916 $ 25,555,534