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Schedule of Inventories (Detail) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Schedule of Inventory [Line Items]    
Raw materials $ 3,000,429 $ 3,563,395
Work-in-process 6,241,522 5,936,578
Finished products 2,261,120 3,863,100
Total $ 11,503,071 $ 13,363,073