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

  
Nine months ended
 
         
  
September 30, 2014
  
September 30, 2013
 
  
Product Revenues
  
% of Total
  
Product Revenues
  
% of Total
 
         
North America
 
$
614,000
   
25
%
 
$
822,000
   
19
%
Japan
  
1,323,000
   
53
%
  
1,892,000
   
43
%
Europe
  
427,000
   
17
%
  
865,000
   
19
%
Other countries
  
120,000
   
5
%
  
837,000
   
19
%
Total product revenues
 
$
2,484,000
   
100
%
 
$
4,416,000
   
100
%