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Revenue Recognition (Tables)
 6 Months Ended
Jun. 30, 2015
Revenue Recognition [Abstract]  
Product Revenues by Geographic Location
Product revenues, classified by geographic location, are as follows:
 
  
Three months ended
  Six months ended 
                 
  
June 30, 2015
  
June 30, 2014
  
June 30, 2015
  
June 30, 2014
 
  
Product
Revenues
  
% of
Total
  
Product
Revenues
  
% of
Total
  
Product
Revenues
  
% of
Total
  
Product
Revenues
  
% of
Total
 
                 
Americas
 
$
272,000
   
17
%
 
$
227,000
   
24
%
 
$
477,000
   
19
%
 
$
264,000
   
14
%
Japan
  
352,000
   
22
%
  
618,000
   
66
%
  
957,000
   
38
%
  
1,263,000
   
64
%
Europe
  
328,000
   
20
%
  
90,000
   
10
%
  
416,000
   
17
%
  
438,000
   
22
%
Asia Pacific
  
662,000
   
41
%
  
—
   
—
   
666,000
   
26
%
  
—
   
—
 
Total product revenues
 
$
1,614,000
   
100
%
 
$
935,000
   
100
%
 
$
2,516,000
   
100
%
 
$
1,965,000
   
100
%