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Investments
 12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Investments
INVESTMENTS
Investments in Marketable Securities
The Company’s investments in available-for-sale marketable securities are made pursuant to its investment policy, which has established guidelines relative to the diversification of the Company’s investments and their maturities, with the principal objective of capital preservation and maintaining liquidity that is sufficient to meet cash flow requirements.
 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


As of December 31, 2016, the Company’s investment in corporate bonds, agency bonds, U.S. treasury securities and commercial paper had a weighted-average maturity date of approximately seven months. Unrealized gains and losses on investments were not significant, and the Company does not believe the unrealized losses represent other-than-temporary impairments as of December 31, 2016. No marketable securities held have been in a continuous unrealized loss position for more than 12 months as of December 31, 2016.
Strategic Investments
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


The Company accounted for each of these investments using the cost method of accounting, as the Company does not have significant influence or a controlling financial interest over these entities. These investments are subject to periodic impairment reviews and are considered to be impaired when a decline in fair value is judged to be other-than-temporary. The Company determined there were no impairments of these investments during the year ended December 31, 2016 or December 31, 2015.
In June 2014, the Company invested $0.5 million in a debt security of a privately-held company. The Company accounted for this debt security as an available-for-sale security at fair value, which was determined to have no value as of December 31, 2016.