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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]  
Summary of Marketable Securities

As of December 31, 2012, the marketable securities were recorded at amortized cost which approximates fair market value which was based on Level 1 inputs. All investments mature in one year or less.

 

     December 31, 2012  
     Fair
Value		      Gross
Unrealized
Losses		      Gross
Unrealized
Gains		  

U.S. government and agency obligations

    $ 13,557       $ —       $ —   

Corporate obligations

      8,925         7         —   

FDIC-insured certificates of deposit

      5,479         1         —   
  

 

 

     

 

 

     

 

 

  
   $ 27,961       $ 8       $ —