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Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017 and December 31, 2016 (in thousands):
 
 
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
June 30, 2017
 
 
 
 
 
 
 
 
U.S. government agency securities and treasuries
 
$
32,519

 
$
—

 
$
(17
)
 
$
32,502

Total available-for-sale securities
 
$
32,519

 
$
—

 
$
(17
)
 
$
32,502


 
 
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
December 31, 2016
 
 
 
 
 
 
 
 
U.S. government agency securities and treasuries
 
$
42,516

 
$
4

 
$
(8
)
 
$
42,512

Corporate debt securities
 
1,554

 
—

 
—

 
1,554

Total available-for-sale securities
 
$
44,070

 
$
4

 
$
(8
)
 
$
44,066