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2. Inventory (Tables)
6 Months Ended
Jun. 30, 2013
Inventory Tables  
Schedule of Inventory
    June 30,
2013
    December 31, 2012  
Raw materials   $ 1,631,343     $ 2,077,779  
Work-in-progress     2,012,925       1,672,957  
Finished goods     617,048       805,044  
Total inventory   $ 4,261,316     $ 4,555,780