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Marketable Securities (Tables)
6 Months Ended
Jun. 30, 2015
Investments Debt And Equity Securities [Abstract]  
Summary of Available for Sale Securities Held

The following table summarizes the available-for-sale securities held at June 30, 2015 and December 31, 2014 (in thousands):

 

Description

 

Amortized Cost

 

 

Unrealized Gains

 

 

Unrealized Losses

 

 

Fair Value

 

June 30, 2015

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U.S. government agency securities

 

$

329,359

 

 

$

29

 

 

$

(89

)

 

$

329,299

 

Certificates of deposit

 

 

13,840

 

 

 

8

 

 

 

(1

)

 

 

13,847

 

Total

 

$

343,199

 

 

$

37

 

 

$

(90

)

 

$

343,146

 

December 31, 2014

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U.S. government agency securities

 

$

131,589

 

 

$

6

 

 

$

(59

)

 

$

131,536

 

Certificates of deposit

 

 

12,640

 

 

 

 

 

 

(18

)

 

 

12,622

 

Total

 

$

144,229

 

 

$

6

 

 

$

(77

)

 

$

144,158