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Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Marketable Securities
Available-for-sale marketable securities as of September 30, 2017 and December 31, 2016 were as follows (in thousands):
 
September 30, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
U.S. Treasury securities
$
12,770

 
$
—

 
$
(11
)
 
$
12,759

Government-sponsored enterprises
22,995

 
—

 
(12
)
 
22,983

Corporate debt securities
77,025

 
12

 
(16
)
 
77,021

Total
$
112,790

 
$
12

 
$
(39
)
 
$
112,763

 
December 31, 2016
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
U.S. Treasury securities
$
4,826

 
$
—

 
$
(1
)
 
$
4,825

Government-sponsored enterprises
29,764

 
5

 
(10
)
 
29,759

Corporate debt securities
166,376

 
51

 
(127
)
 
166,300

Total
$
200,966

 
$
56

 
$
(138
)
 
$
200,884