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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Schedule of Assets Measured at Fair Value on a Recurring Basis

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

 

As of December 31, 2015

(in thousands)

    Level 1      Level 2      Level 3  

Assets:

      

Cash equivalents – money market funds

    $ 704       $ —         $ —     

Marketable securities – commercial paper

      —           —           —     

Marketable securities – corporate debt securities

      —           —           —     

As of December 31, 2014

(in thousands)

    Level 1      Level 2      Level 3  

Assets:

      

Cash equivalents – money market funds

    $ 33,199       $ —         $ —     

Marketable securities – commercial paper

      —           6,491         —     

Marketable securities – corporate debt securities

      —           81,849         —