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Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Marketable Securities
Available-for-sale marketable securities as of June 30, 2017 and December 31, 2016 were as follows (in thousands):
 
June 30, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
U.S. Treasury securities
$
13,802

 
$
—

 
$
(20
)
 
$
13,782

Government-sponsored enterprises
26,159

 
—

 
(30
)
 
26,129

Corporate debt securities
87,152

 
5

 
(35
)
 
87,122

Total
$
127,113

 
$
5

 
$
(85
)
 
$
127,033

 
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