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3. Inventory (Tables)
12 Months Ended
Dec. 31, 2012
Inventory Tables  
Schedule of Inventory
    As of December 31,  
    2012     2011  
Raw materials   $ 2,077,779     $ 628,366  
Work-in-progress     1,672,957       2,056,771  
Finished goods     805,044       1,296,860  
Total inventory   $ 4,555,780     $ 3,981,997