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Business Segment, Geographic Areas and Major Customers (Tables)
3 Months Ended
Mar. 31, 2013
Business Segment, Geographic Areas and Major Customers [Abstract]  
Product sales by geographic location
                 
    Three Months Ended  
    March 31,  
    2013     2012  
    (in thousands)  

United States

  $ 26,150     $ 6,441  

Germany

    12,330       9,532  

International, excluding Germany

    10,759       10,373  
   

 

 

   

 

 

 
    $ 49,239     $ 26,346