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Schedule of Inventories (Detail) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Inventory [Line Items]    
Raw materials $ 4,356,520 $ 4,064,317
Work-in-process 3,583,924 4,112,478
Finished products 2,123,251 2,966,900
Total $ 10,063,695 $ 11,143,695