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Inventory - Summary of inventory (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 8,104,071 $ 7,576,862
Work-in-process 503,148 314,321
Finished goods 1,483,255 659,274
Total inventory $ 10,090,474 $ 8,550,457