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Investments (Tables)
 12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Schedule of marketable securities
 The following is a summary of investments in marketable securities, including money market funds, which meet the definition of a cash equivalent, as of December 31, 2016 and 2015 (in thousands):
 
December 31, 2016
 
Amortized Cost Basis
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Money market funds
$
48,136

 
$
—

 
$
—

 
$
48,136

Corporate bonds
60,725

 
1

 
(50
)
 
60,676

Agency bonds
28,954

 
2

 
(26
)
 
28,930

U.S. treasury securities
157,829

 
17

 
(160
)
 
157,686

Commercial paper
10,473

 
—

 
—

 
10,473

 
$
306,117

 
$
20

 
$
(236
)
 
$
305,901


 
December 31, 2015
 
Amortized Cost Basis
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Money market funds
$
61,986

 
$
—

 
$
—

 
$
61,986

Corporate bonds
56,205

 
3

 
(99
)
 
56,109

Agency bonds
85,572

 
—

 
(111
)
 
85,461

U.S. treasury securities
58,004

 
2

 
(98
)
 
57,908

 
$
261,767

 
$
5

 
$
(308
)
 
$
261,464
Summary of strategic investments in equity securities
The following is a summary of the Company’s strategic investments in equity securities of privately-held companies as of December 31, 2016 (in thousands):
September 2016 investment
$
500

April 2016 investment
112

December 2015 investment
350

July 2015 investment
250

May 2015 investment
500

September 2014 investment
360

 
$
2,072