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Fair Value Measurements - Level of the fair value hierarchy (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Fair Value Measurements |  |
Total fair value of financial assets | $ 791,553 | $ 875,336
LEVEL 1 |  |
Fair Value Measurements |  |
Total fair value of financial assets | 469,746 | 424,343
LEVEL 2 |  |
Fair Value Measurements |  |
Total fair value of financial assets | 321,807 | 450,993
Recurring | Money market funds |  |
Fair Value Measurements |  |
Total fair value of financial assets | 85,462 | 161,328
Recurring | U.S. government bonds |  |
Fair Value Measurements |  |
Total fair value of financial assets | 384,284 | 263,015
Recurring | U.S. government agency bonds |  |
Fair Value Measurements |  |
Total fair value of financial assets | 44,731 | 46,957
Recurring | Corporate debt securities |  |
Fair Value Measurements |  |
Total fair value of financial assets | 277,076 | 404,036
Recurring | LEVEL 1 | Money market funds |  |
Fair Value Measurements |  |
Total fair value of financial assets | 85,462 | 161,328
Recurring | LEVEL 1 | U.S. government bonds |  |
Fair Value Measurements |  |
Total fair value of financial assets | 384,284 | 263,015
Recurring | LEVEL 2 | U.S. government agency bonds |  |
Fair Value Measurements |  |
Total fair value of financial assets | 44,731 | 46,957
Recurring | LEVEL 2 | Corporate debt securities |  |
Fair Value Measurements |  |
Total fair value of financial assets | $ 277,076 | $ 404,036

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