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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Money market funds $ 14,954 $ 9,111
Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Money market funds 14,954 9,111
Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Money market funds 0 0
Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Money market funds $ 0 $ 0