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Inventories (Tables)
3 Months Ended
Mar. 31, 2015
Inventories [Abstract]  
Summary of composition of inventories
 
  March 31, 
2015
  December 31, 
2014
 
Raw materials $4,089,753  $3,365,093 
Finished goods  6,298,150   5,021,536 
Inventories, gross  10,387,903   8,386,629 
         
Inventory reserves  (290,796)  (277,296)
         
Inventories, net $10,097,107  $8,109,333