Cash and Cash Equivalents and Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2016
Cash And Cash Equivalents [Abstract]  
Summary of Available for Sale Securities

The following is a summary of available-for-sale securities as of September 30, 2016 (in thousands):

 

 

 

Amortized Cost

 

 

Unrealized Gains

 

 

Unrealized Losses

 

 

Fair Value

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U.S. treasury securities

 

$

55,092

 

 

$

14

 

 

$

(3

)

 

$

55,103

 

Government agencies

 

 

12,748

 

 

 

3

 

 

 

—

 

 

 

12,751

 

           Total

 

$

67,840

 

 

$

17

 

 

$

(3

)

 

$

67,854