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Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of Marketable Securities Held
The following table summarizes the marketable securities held at June 30, 2020 and December 31, 2019 (in thousands):
Description
Amortized
cost / Cost
Unrealized
gains
Unrealized
losses
Fair
value
June 30, 2020
U.S. government agency securities and treasuries
$201,362  $1,294  $(5) $202,651  
Corporate bonds
151,305  1,620  —  152,925  
Commercial paper
34,922  ——  34,922  
Equity securities
20,017  —(10,490) 9,527  
Total
$407,606  $2,914  $(10,495) $400,025  
December 31, 2019
U.S. government agency securities and treasuries$633,970  $2,014  $(48) $635,936  
Certificates of deposit
960  —  —  960  
Corporate bonds
185,827  824  (43) 186,608  
Commercial paper
74,378  —  —  74,378  
Equity securities
20,017  —  (7,147) 12,870  
Total
$915,152  $2,838  $(7,238) $910,752