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Fair Value Measurements - Financial Assets Measured at Fair Value on a Recurring Basis by Level Within Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Financial Assets, Amortized Cost | $ 836,112 |  | $ 406,883 |
Financial Assets, Gross Unrealized Holding Gains | 235 |  | 140 |
Financial Assets, Gross Unrealized Holding Losses | (1) |  | (5) |
Financial Assets, Aggregate Fair Value | 836,346 |  | 407,018 |
Level 1 | Money Market Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Financial Assets, Amortized Cost | 472,272 | [1] | 106,127 | [2]
Financial Assets, Aggregate Fair Value | 472,272 | [1] | 106,127 | [2]
Level 2 | U.S. Government Treasuries |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Financial Assets, Amortized Cost | 363,840 |  | 298,256 | [3]
Financial Assets, Gross Unrealized Holding Gains | 235 |  | 140 | [3]
Financial Assets, Gross Unrealized Holding Losses | (1) |  | (5) | [3]
Financial Assets, Aggregate Fair Value | $ 364,074 |  | 298,391 | [3]
Level 2 | Bank Time Deposits |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Financial Assets, Amortized Cost |  |  | 2,500 |
Financial Assets, Aggregate Fair Value |  |  | $ 2,500 |
[1] | Includes $10.6 million of restricted cash equivalents.
[2] | Includes $13.5 million of restricted cash equivalents.
[3] | Includes $24.3 million classified as long-term investments.

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