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Marketable Securities and Equity Investments (Tables)
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Cash Equivalents and Marketable Securities
A summary of the Company’s cash equivalents and marketable securities, which are recorded at fair value (and do not include $2.3 billion and $2.3 billion of cash as of June 30, 2020 and December 31, 2019, respectively), is shown below:
As of June 30, 2020As of December 31, 2019
Amortized Cost
Gross 
Unrealized 
Gains
Gross 
Unrealized 
Losses
Fair Value
Amortized Cost
Gross 
Unrealized 
Gains
Gross 
Unrealized 
Losses
Fair Value
(in thousands)
Cash equivalents:
Money market funds
$2,476,713  $—  $—  $2,476,713  $791,039  $—  $—  $791,039  
Corporate debt securities
4,836  —  (1) 4,835  6,070  —  —  6,070  
Commercial paper
93,084  23  —  93,107  29,470  3  (1) 29,472  
Total cash equivalents
2,574,633  23  (1) 2,574,655  826,579  3  (1) 826,581  
Marketable securities:
Government-sponsored enterprise securities
11,198  55  —  11,253  12,689  44  —  12,733  
Corporate debt securities
292,085  1,897  (6) 293,976  301,458  391  (50) 301,799  
Commercial paper
94,396  492  (7) 94,881  102,240  121  (5) 102,356  
Total marketable debt securities
397,679  2,444  (13) 400,110  416,387  556  (55) 416,888  
Corporate equity securities
67,054  152,273  —  219,327  113,829  168,255  —  282,084  
Total marketable securities
$464,733  $154,717  $(13) $619,437  $530,216  $168,811  $(55) $698,972  
Available-for-sale debt securities were classified on the Company's condensed consolidated balance sheets at fair value as follows:
As of June 30, 2020As of December 31, 2019
(in thousands)
Cash and cash equivalents
$2,574,655  $826,581  
Marketable securities
400,110  416,888  
Total
$2,974,765  $1,243,469  
Available-for-sale debt securities by contractual maturity were as follows:
As of June 30, 2020As of December 31, 2019
(in thousands)
Matures within one year$2,939,879  $1,137,942  
Matures after one year through five years
34,886  105,527  
Total
$2,974,765  $1,243,469