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Inventories (Tables)
3 Months Ended
Sep. 30, 2013
Inventory Disclosure [Abstract]  
Inventory components
   September 30,  December 31,
   2013  2012
Raw materials and sub-assemblies  $994,388   $921,677 
Finished goods   62,005    19,390 
   $1,056,393  $941,067