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Inventory (Detail) (USD $) | Jun. 30, 2012 | Dec. 31, 2011
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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

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