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Inventories (Detail) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Inventory Disclosure [Line Items]    
Raw materials $ 6,109,807 $ 4,091,366
Work-in-process 777,056 1,503,565
Finished goods 1,396,609 1,707,552
Total $ 8,283,472 $ 7,302,483