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Inventories (Tables)
12 Months Ended
Dec. 31, 2012
Inventories [Abstract]  
Inventories
                 
    December 31,  
    2011     2012  

Purchased materials

  $ 1,369,041     $ 1,013,492  

Finished goods

    1,596,877       1,561,043  

Inventory obsolescence reserve

    (257,837     (451,156
   

 

 

   

 

 

 
    $ 2,708,081     $ 2,123,379