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Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Marketable securities, Total Estimated Fair Value | $ 1,500,000 |
Equity Securities, Total Estimated Fair Value | 133,800 |
Fair Value, Measurements, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash and Marketable securities, Cost or Amortized Cost |  | $ 2,537,472
Marketable securities, Gross Unrealized Gains |  | 131
Marketable securities, Gross Unrealized Losses |  | (63)
Cash and Marketable Securities, Total Estimated Fair Value |  | 2,537,540
Cash, Equity Securities and Marketable securities, Cost or Amortized Cost | 3,553,011 |
Equity Securities and Marketable securities, Gross Unrealized Gains | 62,692 |
Equity Securities and Marketable securities, Gross Unrealized Losses | (99) |
Cash, Equity Securities and Marketable Securities, Total Estimated Fair Value | 3,615,604 |
Fair Value, Measurements, Recurring | Cash |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash, Cost or Amortized Cost | 1,906,445 | 464,006
Cash, Total Estimated Fair Value | 1,906,445 | 464,006
Fair Value, Measurements, Recurring | Level 1 Securities | U.S. Government Securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Marketable securities, Cost or Amortized Cost | 767,710 | 1,272,125
Marketable securities, Gross Unrealized Gains | 45 | 122
Marketable securities, Gross Unrealized Losses | (45) | (21)
Marketable securities, Total Estimated Fair Value | 767,710 | 1,272,226
Fair Value, Measurements, Recurring | Level 1 Securities | U.S. Government Agency Securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Marketable securities, Cost or Amortized Cost | 135,445 | 245,055
Marketable securities, Gross Unrealized Gains | 1 | 8
Marketable securities, Gross Unrealized Losses | (10) | (24)
Marketable securities, Total Estimated Fair Value | 135,436 | 245,039
Fair Value, Measurements, Recurring | Level 1 Securities | Publicly Traded Equity Securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity Securities, Fair Value | 71,139 |
Equity Securities, Gross Unrealized Gains | 62,644 |
Equity Securities, Total Estimated Fair Value | 133,783 |
Fair Value, Measurements, Recurring | Level 2 Securities | Corporate Debt Securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Marketable securities, Cost or Amortized Cost | 113,900 | 81,158
Marketable securities, Gross Unrealized Gains | 2 | 1
Marketable securities, Gross Unrealized Losses | (44) | (18)
Marketable securities, Total Estimated Fair Value | 113,858 | 81,141
Fair Value, Measurements, Recurring | Level 2 Securities | Commercial Paper |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Marketable securities, Cost or Amortized Cost | 471,936 | 425,861
Marketable securities, Total Estimated Fair Value | 471,936 | 425,861
Fair Value, Measurements, Recurring | Level 2 Securities | Certificates of Deposit |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Marketable securities, Cost or Amortized Cost | 86,436 | 49,267
Marketable securities, Total Estimated Fair Value | $ 86,436 | $ 49,267

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