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Revenue Recognition (Tables)
3 Months Ended
Mar. 31, 2013
Revenue Recognition [Abstract]  
Product Revenues by Geographic Location
Product revenues, classified by geographic location, are as follows:
 
 
Three months ended
 
March 31, 2013
 
March 31, 2012
 
Product Revenues
 
 % of Total
 
 
Product Revenues
 
% of Total
 
 
 
 
 
 
 
 
 
North America
 
$
295,000
 
21
%
 
$
214,000
 
14
%
Japan
 
 
699,000
 
50
%
 
 
549,000
 
37
%
Europe
 
 
333,000
 
24
%
 
 
352,000
 
24
%
Other countries
 
 
65,000
 
5
%
 
 
366,000
 
25
%
Total product revenues
 
$
1,392,000
 
100
%
 
$
1,481,000
 
100
%