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Inventories (Tables)
3 Months Ended
Jun. 30, 2013
Inventory Disclosure [Abstract]  
Inventory components
   June 30,  December 31,
   2013  2012
Raw materials and sub-assemblies  $957,083   $921,677 
Finished goods   75,083    19,390 
   $1,032,166  $941,067