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Schedule of Inventories (Detail) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Inventory [Line Items]    
Raw materials $ 4,224,034 $ 4,557,870
Work-in-process 3,032,739 4,285,648
Finished products 4,184,544 2,955,120
Total $ 11,441,317 $ 11,798,638