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Product Line and Significant Customer Information (Tables)
 3 Months Ended
Mar. 31, 2012
Segment Reporting [Abstract]  
Schedule of Product Sales by Product Line
Product sales by product line for the three month periods ended March 31, 2012 and 2011 were as follows (in thousands):
 
 
Three Months Ended March 31,
 
 
2012
 
2011
 
 
$
 
%
 
$
 
%
Clinical diagnostics
 
$
94,919

 
63
%
 
$
88,290

 
64
%
Blood screening
 
52,543

 
35
%
 
46,705

 
34
%
Research products and services
 
2,655

 
2
%
 
3,117

 
2
%
Total product sales
 
$
150,117

 
100
%
 
$
138,112

 
100
%