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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities
Available-for-sale marketable securities as of December 31, 2016 and 2015 were as follows (in thousands):
 
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

 
December 31, 2015
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
U.S. Treasury securities
$
9,354

 
$
1

 
$
(6
)
 
$
9,349

Government-sponsored enterprises
22,055

 
1

 
(9
)
 
22,047

Corporate debt securities
111,473

 
42

 
(34
)
 
111,481

Total
$
142,882

 
$
44

 
$
(49
)
 
$
142,877


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