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Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Fair Value Measurements, Financial Assets    
Cash and cash equivalents: $ 254,065 $ 248,859
Amortized Cost or Carrying Value 3,059,224 3,605,208
Amortized Cost or Carrying Value 3,071,424  
Gross Unrealized Gains 57 307
Gross Unrealized Losses Less Than 12 Months (11,581) (13,504)
Gross Unrealized Losses More Than 12 Months (51,013) (88,694)
Marketable securities, aggregate fair value 2,996,687 3,503,317
Equity securities, aggregate fair value 12,200  
Investments, aggregate fair value 3,008,887  
Total financial assets 3,325,489 3,854,067
Total financial assets 3,262,952 3,752,176
Level 1    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents: 254,065 46,610
Marketable securities, aggregate fair value 511,821 617,411
Equity securities, aggregate fair value 12,200  
Investments, aggregate fair value 524,021  
Total financial assets 778,086 664,021
Level 2    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents: 0 202,249
Marketable securities, aggregate fair value 2,484,866 2,885,906
Equity securities, aggregate fair value 0  
Investments, aggregate fair value 2,484,866  
Total financial assets 2,484,866 3,088,155
Level 3    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents: 0 0
Marketable securities, aggregate fair value 0 0
Equity securities, aggregate fair value 0  
Investments, aggregate fair value 0  
Total financial assets 0 0
U.S. Treasury securities    
Fair Value Measurements, Financial Assets    
Amortized Cost or Carrying Value 356,379 481,463
Gross Unrealized Gains 1 0
Gross Unrealized Losses Less Than 12 Months (536) (1,269)
Gross Unrealized Losses More Than 12 Months (5,875) (11,347)
Marketable securities, aggregate fair value 349,969 468,847
U.S. Treasury securities | Level 1    
Fair Value Measurements, Financial Assets    
Marketable securities, aggregate fair value 349,969 468,847
U.S. Treasury securities | Level 2    
Fair Value Measurements, Financial Assets    
Marketable securities, aggregate fair value 0 0
U.S. Treasury securities | Level 3    
Fair Value Measurements, Financial Assets    
Marketable securities, aggregate fair value 0 0
Non-U.S. government securities    
Fair Value Measurements, Financial Assets    
Amortized Cost or Carrying Value 166,324 149,901
Gross Unrealized Gains 0 0
Gross Unrealized Losses Less Than 12 Months (96) (33)
Gross Unrealized Losses More Than 12 Months (4,376) (6,304)
Marketable securities, aggregate fair value 161,852 143,564
Non-U.S. government securities | Level 1    
Fair Value Measurements, Financial Assets    
Marketable securities, aggregate fair value 161,852 143,564
Non-U.S. government securities | Level 2    
Fair Value Measurements, Financial Assets    
Marketable securities, aggregate fair value 0 0
Non-U.S. government securities | Level 3    
Fair Value Measurements, Financial Assets    
Marketable securities, aggregate fair value 0 0
Corporate debt securities and commercial paper    
Fair Value Measurements, Financial Assets    
Amortized Cost or Carrying Value 2,536,521 2,973,844
Gross Unrealized Gains 56 307
Gross Unrealized Losses Less Than 12 Months (10,949) (12,202)
Gross Unrealized Losses More Than 12 Months (40,762) (71,043)
Marketable securities, aggregate fair value 2,484,866 2,890,906
Corporate debt securities and commercial paper | Level 1    
Fair Value Measurements, Financial Assets    
Marketable securities, aggregate fair value 0 5,000
Corporate debt securities and commercial paper | Level 2    
Fair Value Measurements, Financial Assets    
Marketable securities, aggregate fair value 2,484,866 2,885,906
Corporate debt securities and commercial paper | Level 3    
Fair Value Measurements, Financial Assets    
Marketable securities, aggregate fair value 0 0
Equity securities    
Fair Value Measurements, Financial Assets    
Amortized Cost or Carrying Value 12,200  
Money market funds    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents: 254,065 46,610
Money market funds | Level 1    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents: 254,065 46,610
Money market funds | Level 2    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents: 0 0
Money market funds | Level 3    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents: $ 0 0
Reverse repurchase agreements    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents:   200,000
Reverse repurchase agreements | Level 1    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents:   0
Reverse repurchase agreements | Level 2    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents:   200,000
Reverse repurchase agreements | Level 3    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents:   0
Commercial paper    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents:   2,249
Commercial paper | Level 1    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents:  
Commercial paper | Level 2    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents:   2,249
Commercial paper | Level 3    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents: