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Fair Value Measurements (Details) - Estimate of Fair Value Measurement - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Money market funds $ 12,989 $ 17,480
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Money market funds 12,989 17,480
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