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Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Summary of Available-for-sale Securities Held
The following table summarizes the available-for-sale securities held at September 30, 2016 (in thousands):
 
 
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
September 30, 2016
 
 
 
 
 
 
 
 
U.S. government agency securities and treasuries
 
$
25,013

 
$
7

 
$
(3
)
 
$
25,017

Corporate debt securities
 
14,695

 
—

 
(12
)
 
14,683

Total available-for-sale securities
 
$
39,708

 
$
7

 
$
(15
)
 
$
39,700