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Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of Marketable Securities Held
The following table summarizes the marketable securities held at March 31, 2020 and December 31, 2019 (in thousands):
Description
Amortized
cost / Cost
Unrealized
gains
Unrealized
losses
Fair
value
March 31, 2020
U.S. government agency securities and treasuries
$377,551  $2,741  $(15) $380,277  
Certificates of deposit
240  —  —  240  
Corporate bonds
207,708  613  (1,110) 207,211  
Commercial paper
75,650  —  —  75,650  
Equity securities
20,017  —  (11,667) 8,350  
Total
$681,166  $3,354  $(12,792) $671,728  
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