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Revenue Recognition (Tables)
6 Months Ended
Jun. 30, 2013
Revenue Recognition [Abstract]  
Product Revenues by Geographic Location
Product revenues, classified by geographic location, are as follows:

 
 
Six months ended
 
 
 
  
  
  
 
 
 
June 30, 2013
  
June 30, 2012
 
 
 
Product
Revenues
  
% of
Total
  
Product
Revenues
  
% of
Total
 
 
 
  
  
  
 
North America  
 
$
583,000
   
21
%
 
$
487,000
   
14
%
Japan  
  
1,487,000
   
53
%
  
1,749,000
   
51
%
Europe  
  
625,000
   
22
%
  
619,000
   
18
%
Other countries  
  
105,000
   
4
%
  
572,000
   
17
%
Total product revenues  
 
$
2,800,000
   
100
%
 
$
3,427,000
   
100
%