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Inventories (Detail) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Inventory Disclosure [Line Items]    
Raw materials $ 5,655,726 $ 4,091,366
Work-in-process 1,450,843 1,503,565
Finished goods 1,825,923 1,707,552
Total $ 8,932,492 $ 7,302,483