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Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash, Cost or Amortized Cost | $ 967,519 | $ 545,618
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 | 2,556,513 | 2,537,472
Cash and Marketable securities, Gross Unrealized Gains | 202 | 131
Cash and Marketable securities, Gross Unrealized Losses | (18) | (63)
Cash and Marketable Securities, Total Estimated Fair Value | 2,556,697 | 2,537,540
Fair Value, Measurements, Recurring | Cash |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash, Cost or Amortized Cost | 930,155 | 464,006
Cash, Total Estimated Fair Value | 930,155 | 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 | 1,002,193 | 1,272,125
Marketable securities, Gross Unrealized Gains | 193 | 122
Marketable securities, Gross Unrealized Losses |  | (21)
Marketable securities, Total Estimated Fair Value | 1,002,386 | 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 | 123,354 | 245,055
Marketable securities, Gross Unrealized Gains | 6 | 8
Marketable securities, Gross Unrealized Losses | (6) | (24)
Marketable securities, Total Estimated Fair Value | 123,354 | 245,039
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 | 68,483 | 81,158
Marketable securities, Gross Unrealized Gains | 3 | 1
Marketable securities, Gross Unrealized Losses | (12) | (18)
Marketable securities, Total Estimated Fair Value | 68,474 | 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 | 397,233 | 425,861
Marketable securities, Total Estimated Fair Value | 397,233 | 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 | 35,095 | 49,267
Marketable securities, Total Estimated Fair Value | $ 35,095 | $ 49,267

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