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Revenue Recognition (Tables)
3 Months Ended
Mar. 31, 2016
Revenue Recognition [Abstract]  
Product Revenues by Geographic Location
Product revenues, classified by geographic location, are as follows:

  
Three months ended
 
             
  
March 31, 2016
  
March 31, 2015
 
  
Product
Revenues
  
% of
Total
  
Product
Revenues
  
% of
Total
 
             
Americas
 
$
235,000
   
18
%
 
$
201,000
   
22
%
Japan
  
966,000
   
72
%
  
605,000
   
67
%
EMEA
  
132,000
   
10
%
  
92,000
   
10
%
Asia Pacific
  
   
0
%
  
4,000
   
1
%
Total product revenues
 
$
1,333,000
   
100
%
 
$
902,000
   
100
%