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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2016
Fair Value of Financial Instruments [Abstract]  
Financial Assets Measured at Fair Value on a Recurring Basis

Financial assets measured at fair value on a recurring basis were as follows (in thousands):

 
Fair Value Measurements at September 30, 2016
 
 
  
Quoted Prices in Active Markets for Identical Assets
 
Significant Other Observable Inputs
 
Significant Unobservable Inputs
 
 
Total
 
Level 1
 
Level 2
 
Level 3
 
Assets:
        
Money market funds
 
$
46,991
  
$
46,991
  
$
–
  
$
–
 
Government-sponsored enterprises
  
37,655
   
–
   
37,655
   
–
 
Corporate debt securities
  
166,568
   
–
   
166,568
   
–
 
Total assets measured at fair value(a)
 
$
251,214
  
$
46,991
  
$
204,223
  
$
–
 

(a) Total assets measured at fair value at September 30, 2016, includes approximately $47.0 million reported in cash and cash equivalents on the balance sheet.


 
Fair Value Measurements at December 31, 2015
 
 
  
Quoted Prices in Active Markets for Identical Assets
 
Significant Other Observable Inputs
 
Significant Unobservable Inputs
 
 
Total
 
Level 1
 
Level 2
 
Level 3
 
Assets:
        
Money market funds
 
$
62,353
  
$
62,353
  
$
–
  
$
–
 
U.S. Treasury securities
  
9,349
   
–
   
9,349
   
–
 
Government-sponsored enterprises
  
41,202
   
–
   
41,202
   
–
 
Corporate debt securities
  
137,928
   
–
   
137,928
   
–
 
Total assets measured at fair value(a)
 
$
250,832
  
$
62,353
  
$
188,479
  
$
–
 

(a) Total assets measured at fair value at December 31, 2015, includes approximately $108.0 million reported in cash and cash equivalents on the balance sheet.