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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2014
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, 2014 and December 31, 2013 and the input categories associated with those assets and liabilities:

 

As of June 30, 2014

(in thousands)

    Level 1      Level 2      Level 3  

Assets:

         

Cash equivalents – money market funds

    $ 67,108       $ —        $ —    

Investments – commercial paper

      —           14,995         —     

 

As of December 31, 2013

(in thousands)

    Level 1      Level 2      Level 3  

Assets:

         

Cash equivalents – money market funds

    $ 47,740       $ —         $ —     

Cash equivalents – corporate debt securities

      —           13,998         —     

Investments – commercial paper

      —           49,680         —     

Investments – corporate debt securities

      —           40,436         —