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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Available-For-Sale Securities
Available-for-sale marketable securities as of December 31, 2017 and 2016 were as follows (in thousands):
 
December 31, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
U.S. Treasury securities
$
3,995

 
$
—

 
$
(6
)
 
$
3,989

Government-sponsored enterprises
11,998

 
—

 
(7
)
 
11,991

Corporate debt securities
77,462

 
2

 
(50
)
 
77,414

Total
$
93,455

 
$
2

 
$
(63
)
 
$
93,394

 
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


All of the Company's available-for-sale securities held at December 31, 2017 had maturity dates of less than one year. The contractual maturities of the available-for-sale marketable securities as of December 31, 2016 were as follows (in thousands):
 
Amortized Cost
 
Fair Value
Mature in one year or less
$
192,985

 
$
192,898

Mature between one and five years
7,981

 
7,986

Total
$
200,966

 
$
200,884