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Inventory (Detail) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Schedule of Inventory [Line Items]    
Raw materials $ 780,747 $ 848,596
Finished goods 3,189,299 3,604,247
Allowance for obsolete and slow-moving inventory (14,814) (14,871)
Inventories $ 3,955,232 $ 4,437,972