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

 
 
Nine months ended
 
 
 
  
  
  
 
 
 
September 30, 2013
  
September 30, 2012
 
 
 
Product
Revenues
  
% of
Total
  
Product
Revenues
  
% of
Total
 
 
 
  
  
  
 
North America
 
$
822,000
   
19
%
 
$
810,000
   
17
%
Japan
  
1,892,000
   
43
%
  
2,273,000
   
48
%
Europe
  
865,000
   
19
%
  
1,006,000
   
21
%
Other countries
  
837,000
   
19
%
  
652,000
   
14
%
Total product revenues
 
$
4,416,000
   
100
%
 
$
4,741,000
   
100
%