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Inventory Stated at the Lower of Cost or Market (Detail) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Schedule of Inventory [Line Items]    
Raw materials $ 9,914,530 $ 9,934,724
Work-in-process 2,838,868 5,220,353
Finished goods 7,160,338 5,313,435
Inventory $ 19,913,736 $ 20,468,512