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Marketable Securities
 3 Months Ended
Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Marketable Securities
Available-for-sale marketable securities as of March 31, 2017 and December 31, 2016 were as follows (in thousands):
 
March 31, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
U.S. Treasury securities
$
13,835

 
$
—

 
$
(14
)
 
$
13,821

Government-sponsored enterprises
37,942

 
—

 
(27
)
 
37,915

Corporate debt securities
155,894

 
23

 
(90
)
 
155,827

Total
$
207,671

 
$
23

 
$
(131
)
 
$
207,563

 
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

The contractual maturities of the available-for-sale marketable securities as of March 31, 2017 were as follows (in thousands):
 
Amortized Cost
 
Fair Value
Mature in one year or less
$
202,686

 
$
202,585

Mature between one and five years
4,985

 
4,978

Total
$
207,671

 
$
207,563


All of the Company's available-for-sale securities in an unrealized loss position as of March 31, 2017 and December 31, 2016 were in a loss position for less than twelve months.  There were no unrealized losses at March 31, 2017 or December 31, 2016 that the Company determined to be other-than-temporary.