Marketable Securities and Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Schedule of Marketable Securities by Security Type

As of December 31, 2015, marketable securities by security type consisted of:

 

     Amortized
Cost		      Gross
Unrealized
Gains		      Gross
Unrealized
Losses		     Estimated
Fair
Value		  

Certificates of Deposit (due within one year)

    $ 13,709       $ —         $ —        $ 13,709   

Certificates of Deposit (due after one year through two years)

      1,178         —           —          1,178   

United States Treasury Notes (due within one year)

      22,596         —           (47 )      22,549   

United States Treasury Notes (due after one year through two years)

      2,506         —           (8 )      2,498   
  

 

 

     

 

 

     

 

 

    

 

 

  

Total

    $ 39,989       $ —         $ (55 )    $ 39,934   
  

 

 

     

 

 

     

 

 

    

 

 

  

Schedule of Fair Value Measured on Recurring Basis

The following tables present the Company’s fair value hierarchy for its cash equivalents and marketable securities, which are measured at fair value on a recurring basis as of December 31, 2015 and 2014:

 

     Fair Value Measurements at December 31, 2015
Using		  
         Level 1          Level 2          Level 3          Total      

Cash equivalents:

            

Money Market Instruments

    $ —         $ 18,361       $ —         $ 18,361   

Marketable securities:

            

Certificates of Deposit

      —           14,887         —           14,887   

United States Treasury Notes

      —           25,047         —           25,047   
  

 

 

     

 

 

     

 

 

     

 

 

  

Total

    $ —         $ 58,295       $ —         $ 58,295   
  

 

 

     

 

 

     

 

 

     

 

 

  

 

     Fair Value Measurements at December 31, 2014
Using		  
         Level 1          Level 2          Level 3          Total      

Cash equivalents:

            

Money Market Instruments

    $ —         $ 91,316       $ —         $ 91,316   
  

 

 

     

 

 

     

 

 

     

 

 

  

Total

    $ —         $ 91,316       $ —         $ 91,316