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Investments and Fair Value Measurements - Schedule of Assets Carried at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Cash equivalents | $ 175,325 | $ 73,635
Marketable investments | 675,704 | 587,096
Level 1 |  |
Assets |  |
Cash equivalents | 175,325 | 71,644
Marketable investments | 508,385 | 315,437
Level 2 |  |
Assets |  |
Cash equivalents | 0 | 1,991
Marketable investments | 167,319 | 271,659
Level 3 |  |
Assets |  |
Cash equivalents | 0 | 0
Marketable investments | 0 | 0
Certificates of deposit |  |
Assets |  |
Marketable investments | 1,547 | 1,463
Certificates of deposit | Level 1 |  |
Assets |  |
Marketable investments | 0 | 0
Certificates of deposit | Level 2 |  |
Assets |  |
Marketable investments | 1,547 | 1,463
Certificates of deposit | Level 3 |  |
Assets |  |
Marketable investments | 0 | 0
U.S. treasury securities |  |
Assets |  |
Marketable investments | 508,385 | 315,437
U.S. treasury securities | Level 1 |  |
Assets |  |
Marketable investments | 508,385 | 315,437
U.S. treasury securities | Level 2 |  |
Assets |  |
Marketable investments | 0 | 0
U.S. treasury securities | Level 3 |  |
Assets |  |
Marketable investments | 0 | 0
U.S. agency and government sponsored securities |  |
Assets |  |
Marketable investments | 113,291 | 239,259
U.S. agency and government sponsored securities | Level 1 |  |
Assets |  |
Marketable investments | 0 | 0
U.S. agency and government sponsored securities | Level 2 |  |
Assets |  |
Marketable investments | 113,291 | 239,259
U.S. agency and government sponsored securities | Level 3 |  |
Assets |  |
Marketable investments | 0 | 0
Commercial paper |  |
Assets |  |
Marketable investments | 9,968 | 17,391
Commercial paper | Level 1 |  |
Assets |  |
Marketable investments | 0 | 0
Commercial paper | Level 2 |  |
Assets |  |
Marketable investments | 9,968 | 17,391
Commercial paper | Level 3 |  |
Assets |  |
Marketable investments | 0 | 0
Municipal bonds |  |
Assets |  |
Marketable investments |  | 928
Municipal bonds | Level 1 |  |
Assets |  |
Marketable investments |  | 0
Municipal bonds | Level 2 |  |
Assets |  |
Marketable investments |  | 928
Municipal bonds | Level 3 |  |
Assets |  |
Marketable investments |  | 0
Corporate bonds |  |
Assets |  |
Marketable investments | 42,513 | 12,618
Corporate bonds | Level 1 |  |
Assets |  |
Marketable investments | 0 | 0
Corporate bonds | Level 2 |  |
Assets |  |
Marketable investments | 42,513 | 12,618
Corporate bonds | Level 3 |  |
Assets |  |
Marketable investments | 0 | 0
Money market funds |  |
Assets |  |
Cash equivalents | 157,556 | 66,661
Money market funds | Level 1 |  |
Assets |  |
Cash equivalents | 157,556 | 66,661
Money market funds | Level 2 |  |
Assets |  |
Cash equivalents | 0 | 0
Money market funds | Level 3 |  |
Assets |  |
Cash equivalents | 0 | 0
Certificates of deposit |  |
Assets |  |
Cash equivalents |  | 493
Certificates of deposit | Level 1 |  |
Assets |  |
Cash equivalents |  | 0
Certificates of deposit | Level 2 |  |
Assets |  |
Cash equivalents |  | 493
Certificates of deposit | Level 3 |  |
Assets |  |
Cash equivalents |  | 0
U.S. treasury securities |  |
Assets |  |
Cash equivalents | 17,769 | 4,983
U.S. treasury securities | Level 1 |  |
Assets |  |
Cash equivalents | 17,769 | 4,983
U.S. treasury securities | Level 2 |  |
Assets |  |
Cash equivalents | 0 | 0
U.S. treasury securities | Level 3 |  |
Assets |  |
Cash equivalents | $ 0 | 0
Commercial paper |  |
Assets |  |
Cash equivalents |  | 1,498
Commercial paper | Level 1 |  |
Assets |  |
Cash equivalents |  | 0
Commercial paper | Level 2 |  |
Assets |  |
Cash equivalents |  | 1,498
Commercial paper | Level 3 |  |
Assets |  |
Cash equivalents |  | $ 0

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