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Marketable Securities
 9 Months Ended
Sep. 30, 2014
Investments Debt And Equity Securities [Abstract]  
Marketable securities

3. Marketable securities

The following table summarizes the available-for-sale securities held at September 30, 2014:

 

Description

 

Amortized Cost

 

 

Unrealized Gains

 

 

Unrealized Losses

 

 

Fair Value

 

September 30, 2014

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U.S. government agency securities

 

$

161,652

 

 

$

3

 

 

$

(48

)

 

$

161,607

 

Certificates of deposit

 

 

12,639

 

 

 

—

 

 

 

(29

)

 

 

12,610

 

Total

 

$

174,291

 

 

$

3

 

 

$

(77

)

 

$

174,217

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Certain short-term securities with original maturities of less than 90 days are included in cash and cash equivalents on the condensed consolidated balance sheets and are not included in the table above. The Company did not hold any available-for-sale securities at December 31, 2013.