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Fair Value Measurements - Level of the fair value hierarchy (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
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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