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Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Fair Value Measurements, Financial Assets    
Cash and cash equivalents: $ 289,997 $ 248,859
Amortized Cost or Carrying Value 3,381,624 3,605,208
Gross Unrealized Gains 1,372 307
Gross Unrealized Losses Less Than 12 Months (6,841) (13,504)
Gross Unrealized Losses More Than 12 Months (65,672) (88,694)
Marketable securities, aggregate fair value 3,310,483 3,503,317
Total financial assets 3,671,621 3,854,067
Total financial assets 3,600,480 3,752,176
Level 1    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents: 289,997 46,610
Marketable securities, aggregate fair value 558,041 617,411
Total financial assets 848,038 664,021
Level 2    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents: 0 202,249
Marketable securities, aggregate fair value 2,752,442 2,885,906
Total financial assets 2,752,442 3,088,155
Level 3    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents: 0 0
Marketable securities, aggregate fair value 0 0
Total financial assets 0 0
U.S. Treasury securities    
Fair Value Measurements, Financial Assets    
Amortized Cost or Carrying Value 416,493 481,463
Gross Unrealized Gains 0 0
Gross Unrealized Losses Less Than 12 Months (650) (1,269)
Gross Unrealized Losses More Than 12 Months (7,747) (11,347)
Marketable securities, aggregate fair value 408,096 468,847
U.S. Treasury securities | Level 1    
Fair Value Measurements, Financial Assets    
Marketable securities, aggregate fair value 408,096 468,847
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 149,510 149,901
Gross Unrealized Gains 0 0
Gross Unrealized Losses Less Than 12 Months (22) (33)
Gross Unrealized Losses More Than 12 Months (4,543) (6,304)
Marketable securities, aggregate fair value 144,945 143,564
Non-U.S. government securities | Level 1    
Fair Value Measurements, Financial Assets    
Marketable securities, aggregate fair value 144,945 143,564
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 2,815,621 2,973,844
Gross Unrealized Gains 1,372 307
Gross Unrealized Losses Less Than 12 Months (6,169) (12,202)
Gross Unrealized Losses More Than 12 Months (53,382) (71,043)
Marketable securities, aggregate fair value 2,757,442 2,890,906
Corporate debt securities and commercial paper | Level 1    
Fair Value Measurements, Financial Assets    
Marketable securities, aggregate fair value 5,000 5,000
Corporate debt securities and commercial paper | Level 2    
Fair Value Measurements, Financial Assets    
Marketable securities, aggregate fair value 2,752,442 2,885,906
Corporate debt securities and commercial paper | Level 3    
Fair Value Measurements, Financial Assets    
Marketable securities, aggregate fair value 0 0
Money market funds    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents: 289,997 46,610
Money market funds | Level 1    
Fair Value Measurements, Financial Assets    
Cash and cash equivalents: 289,997 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: