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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value Measurements [Abstract]  
Summary of financial asset measured at fair value
                         
    June 30, 2012
Fair Value
    Input Level   December 31, 2011
Fair Value
    Input Level

Short-term investments

  $ 20,389     Level 2   $ 27,446     Level 2
   

 

 

       

 

 

     
         
    $ 20,389         $ 27,446