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Cash, 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, 2023 | Dec. 31, 2022
Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 154,511 | $ 202,004
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 154,511 | 202,004
Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 567,417 | 423,796
Unrealized Gains | 6 | 12
Unrealized Losses | (1,518) | (1,417)
Estimated Fair Value | 565,905 | 422,391
Marketable Securities Available-for-Sale | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 721,928 | 625,800
Unrealized Gains | 6 | 12
Unrealized Losses | (1,518) | (1,417)
Estimated Fair Value | 720,416 | 624,395
Cash | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 21,922 | 29,586
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 21,922 | 29,586
Money Market Funds | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 131,837 | 172,418
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 131,837 | 172,418
U.S. Treasuries | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 51,734 | 42,502
Unrealized Gains | 0 | 0
Unrealized Losses | (145) | (194)
Estimated Fair Value | 51,589 | 42,308
U.S. Government Agency Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 190,323 | 88,429
Unrealized Gains | 0 | 0
Unrealized Losses | (1,011) | (397)
Estimated Fair Value | 189,312 | 88,032
Corporate Debt Securities | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 752 |
Unrealized Gains | 0 |
Unrealized Losses | 0 |
Estimated Fair Value | 752 |
Corporate Debt Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 325,360 | 292,865
Unrealized Gains | 6 | 12
Unrealized Losses | (362) | (826)
Estimated Fair Value | $ 325,004 | $ 292,051

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