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Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash, Cost or Amortized Cost | $ 1,251,721 | $ 520,317
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 | 2,827,818 | 2,112,225
Cash and Marketable securities, Gross Unrealized Gains | 1,860 | 665
Cash and Marketable securities, Gross Unrealized Losses | (109) | (85)
Cash and Marketable Securities, Total Estimated Fair Value | 2,829,569 | 2,112,805
Fair Value, Measurements, Recurring | Cash |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cash, Cost or Amortized Cost | 1,189,011 | 416,099
Cash, Total Estimated Fair Value | 1,189,011 | 416,099
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 | 1,263,863 | 1,305,145
Marketable securities, Gross Unrealized Gains | 1,735 | 604
Marketable securities, Gross Unrealized Losses | (46) | (49)
Marketable securities, Total Estimated Fair Value | 1,265,552 | 1,305,700
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 | 339,231 | 269,278
Marketable securities, Gross Unrealized Gains | 111 | 48
Marketable securities, Gross Unrealized Losses | (63) | (32)
Marketable securities, Total Estimated Fair Value | 339,279 | 269,294
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 | 22,407 | 28,420
Marketable securities, Gross Unrealized Gains | 14 | 13
Marketable securities, Gross Unrealized Losses |  | (4)
Marketable securities, Total Estimated Fair Value | 22,421 | 28,429
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 | 8,389 | 84,498
Marketable securities, Total Estimated Fair Value | 8,389 | 84,498
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 | 4,917 | 8,785
Marketable securities, Total Estimated Fair Value | $ 4,917 | $ 8,785

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