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Fair Value Measurements - Schedule of Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Marketable securities: |  |
Gross unrealized gains | $ 158 | $ 1,178
Gross unrealized losses | (1,144) | (364)
Total |  |
Cost or amortized cost | 1,618,644 | 1,166,672
Fair value | 1,617,658 | 1,167,486
Money market funds |  |
Cash equivalents: |  |
Cost or amortized cost | 352,687 | 345,555
Commercial paper | Cash equivalents |  |
Marketable securities: |  |
Cost or amortized cost | 33,887 | 9,994
Gross unrealized gains | 0 | 0
Gross unrealized losses | (15) | (9)
Fair value | 33,872 | 9,985
Commercial paper | Marketable securities |  |
Marketable securities: |  |
Cost or amortized cost | 207,299 | 187,596
Gross unrealized gains | 2 | 148
Gross unrealized losses | (142) | (24)
Fair value | 207,159 | 187,720
U.S. treasury securities |  |
Marketable securities: |  |
Cost or amortized cost | 794,614 | 426,734
Gross unrealized gains | 100 | 697
Gross unrealized losses | (549) | (188)
Fair value | 794,165 | 427,243
U.S. agency bonds |  |
Marketable securities: |  |
Cost or amortized cost | 89,983 | 77,535
Gross unrealized gains | 0 | 13
Gross unrealized losses | (191) | (34)
Fair value | 89,792 | 77,514
Non-U.S. government securities |  |
Marketable securities: |  |
Cost or amortized cost | 4,938 | 21,723
Gross unrealized gains | 0 | 10
Gross unrealized losses | (3) | (27)
Fair value | 4,935 | 21,706
Corporate bonds |  |
Marketable securities: |  |
Cost or amortized cost | 135,236 | 94,725
Gross unrealized gains | 56 | 310
Gross unrealized losses | (244) | (81)
Fair value | $ 135,048 | 94,954
Certificates of deposit |  |
Marketable securities: |  |
Cost or amortized cost |  | 2,810
Gross unrealized gains |  | 0
Gross unrealized losses |  | (1)
Fair value |  | $ 2,809

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