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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2015
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following tables show assets and liabilities measured at fair value on a recurring basis as of June 30, 2015 and December 31, 2014 and the input categories associated with those assets and liabilities:

 

(in thousands)

As of June 30, 2015

    Level 1      Level 2      Level 3  

Assets:

         

Cash equivalents – money market funds

    $ 15,187       $ —         $ —     

Investments – commercial paper

      —           5,000         —     

Investments – corporate debt securities

      —           28,991         —     
  

 

 

     

 

 

     

 

 

  

As of December 31, 2014

    Level 1      Level 2      Level 3  

Assets:

         

Cash equivalents – money market funds

    $ 33,199       $ —         $ —     

Investments – commercial paper

      —           6,491         —     

Investments – corporate debt securities

      —           81,849         —