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Inventories (Tables)
3 Months Ended
Mar. 31, 2014
Inventory Disclosure [Abstract]  
Inventory components
   March 31,  December 31,
   2014  2013
Raw materials and sub-assemblies   $662,013   $1,045,356 
Finished goods    33,834    59,732 
   $695,847   $1,105,088