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Cash and Cash Equivalents, Restricted Cash and Marketable Securities - Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 641,541 | $ 591,177
Unrealized Gains | 3,201 | 1,179
Unrealized Losses | (82) | (333)
Estimated Fair Value | 644,660 | 592,023
Total cash and cash equivalents, and marketable securities, Amortized Cost | 760,873 | 741,455
Total cash and cash equivalents, and marketable securities, Unrealized Gain | 3,201 | 1,180
Total cash and cash equivalents, and marketable securities, Unrealized Loss | (82) | (333)
Total cash and cash equivalents, and marketable securities, Fair Value | 763,992 | 742,302
U.S. treasuries |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 169,214 | 74,109
Unrealized Gains | 1,118 | 172
Unrealized Losses | (7) | (44)
Estimated Fair Value | 170,325 | 74,237
U.S. government agency securities |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 166,881 | 216,265
Unrealized Gains | 1,018 | 692
Unrealized Losses | (40) | (269)
Estimated Fair Value | 167,859 | 216,688
Corporate debt securities |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 305,446 | 300,803
Unrealized Gains | 1,065 | 315
Unrealized Losses | (35) | (20)
Estimated Fair Value | 306,476 | 301,098
Cash and cash equivalents: |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 119,332 | 150,278
Unrealized Gains | 0 | 1
Unrealized Losses | 0 | 0
Estimated Fair Value | 119,332 | 150,279
Cash and cash equivalents: | Cash |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 19,172 | 11,190
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 19,172 | 11,190
Cash and cash equivalents: | Money market funds |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 100,160 | 131,635
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 100,160 | 131,635
Cash and cash equivalents: | Corporate debt securities |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 0 | 7,453
Unrealized Gains | 0 | 1
Unrealized Losses | 0 | 0
Estimated Fair Value | $ 0 | $ 7,454

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