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Fair Value Measurements - Summary of Financial Instruments 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] |  |
Investments, fair value disclosure | $ 392,848 | $ 35,812
Money market funds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investments, fair value disclosure | 356,793 | 2,100
Certificates of deposit |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investments, fair value disclosure | 5,987 | 1,754
U.S. Treasury securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investments, fair value disclosure | 30,068 | 31,958
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investments, fair value disclosure | 392,848 | 35,812
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investments, fair value disclosure | 356,793 | 2,100
Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of deposit |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investments, fair value disclosure | 5,987 | 1,754
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investments, fair value disclosure | $ 30,068 | $ 31,958

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