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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2013
Fair Value Disclosures [Abstract]  
Schedule of assets that are measured at fair value on a recurring basis
 
   
Fair Value Measurement at September 30, 2013 Using:
 
   
Quoted Prices in Active Markets for
Identical Assets
   
Significant Other Observable Inputs
   
Significant Unobservable Inputs
 
   
(Level 1)
   
(Level 2)
   
(Level 3)
 
Corporate debt securities
  $ 2,962     $ -     $ -  
Money market funds (included in cash and cash equivalents)
    70,408       -       -  
    Total
  $ 73,370     $ -     $ -  
 
 
   
Fair Value Measurement at December 31, 2012 Using:
 
   
Quoted Prices in Active Markets for
Identical Assets
   
Significant Other Observable Inputs
   
Significant Unobservable Inputs
 
   
(Level 1)
   
(Level 2)
   
(Level 3)
 
Corporate debt securities
  $ 2,010     $ -     $ -  
Money market funds (included in cash and cash equivalents)
    67,050       -       -  
    Total
  $ 69,060     $ -     $ -