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Schedule of Inventories (Detail) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Inventory [Line Items]    
Raw materials $ 5,175,278 $ 4,557,870
Work-in-process 3,051,182 4,285,648
Finished products 4,597,137 2,955,120
Total $ 12,823,597 $ 11,798,638