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Segment Information (Tables)
12 Months Ended
Dec. 31, 2012
Segment Information  
Summary of total revenues from customers, payors and collaboration partners by geographic region

 

 
  Year Ended December 31,  
 
  2012   2011   2010  
 
  (In thousands)
 

United States

  $ 207,508   $ 187,300   $ 168,021  

Outside of the United States

    27,665     18,811     10,080  
               

Total revenues

  $ 235,173   $ 206,111   $ 178,101