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Inventories (Tables)
9 Months Ended
Sep. 30, 2014
Inventory Disclosure [Abstract]  
Inventory components
   September 30,  December 31,
   2014  2013
Raw materials and sub-assemblies   $704,835   $1,045,356 
Finished goods    161,203    59,732 
   $866,038   $1,105,088