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Inventories (Tables)
6 Months Ended
Jun. 30, 2014
Inventory Disclosure [Abstract]  
Inventory components
   June 30,  December 31,
   2014  2013
Raw materials and sub-assemblies   $578,305   $1,045,356 
Finished goods    149,451    59,732 
   $727,756  $1,105,088