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Fair Value Measurements
3 Months Ended
Sep. 30, 2011
Fair Value Measurements [Abstract] 
Fair Value Measurements
3. Fair Value Measurements
          The fair value of our financial assets was determined using the following inputs at September 30, 2011:
                                 
            Quoted Prices in                
            Active             Significant  
            Markets for     Significant Other     Unobservable  
            Identical Assets     Observable Inputs     Inputs  
    Total     (Level 1)     (Level 2)     (Level 3)  
Cash and cash equivalents
  $ 161,092     $ 161,092     $     $  
 
                       
Total assets recorded at fair value
  $ 161,092     $ 161,092     $     $  
 
                       
          The following table presents a roll forward of assets measured at fair value using significant unobservable inputs (Level 3) at September 30, 2011:
         
Balance at June 30, 2011
  $ 529  
Redemptions
    (529 )
 
     
Balance at September 30, 2011
  $