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Inventories (Tables)
 3 Months Ended
Mar. 31, 2013
Inventories [Abstract]  
Summary of composition of inventories
   
March 31,
2013
    
December 31,
2012
  
Raw materials
  
$
4,147,214
    
$
4,055,812
  
Finished goods
    
6,224,986
      
5,472,771
  
Inventories, gross
    
10,372,200
      
9,528,583
  
                 
Inventory reserves
    
(284,994
)
    
(271,994
)
                 
Inventories, net
  
$
10,087,206
    
$
 9,256,589