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Revenue Recognition (Tables)
6 Months Ended
Jun. 30, 2014
Revenue Recognition [Abstract]  
Product Revenues by Geographic Location
Product revenues, classified by geographic location, are as follows:

 
 
Six months ended
 
 
 
  
  
  
 
 
 
June 30, 2014
  
June 30, 2013
 
 
 
Product
Revenues
  
% of
Total
  
Product
Revenues
  
% of
Total
 
 
 
  
  
  
 
North America
 
$
264,000
   
14
%
 
$
583,000
   
21
%
Japan
  
1,263,000
   
64
%
  
1,487,000
   
53
%
Europe
  
438,000
   
22
%
  
625,000
   
22
%
Other countries
  
   
   
105,000
   
4
%
Total product revenues
 
$
1,965,000
   
100
%
 
$
2,800,000
   
100
%