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Fair Value Measurements - Level of the fair value hierarchy (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value Measurements
Total fair value of financial assets	$ 427,242	$ 461,974
Level 1
Fair Value Measurements
Total fair value of financial assets	159,654	209,378
Level 2
Fair Value Measurements
Total fair value of financial assets	267,588	252,596
Recurring | Money market funds
Fair Value Measurements
Total fair value of financial assets	88,625	124,443
Recurring | Cash equivalents
Fair Value Measurements
Total fair value of financial assets	88,625	124,443
Recurring | U.S. government bonds
Fair Value Measurements
Total fair value of financial assets	71,029	84,935
Recurring | U.S. government agency bonds
Fair Value Measurements
Total fair value of financial assets	78,587	82,340
Recurring | Corporate debt securities
Fair Value Measurements
Total fair value of financial assets	189,001	170,256
Recurring | Short-term investments
Fair Value Measurements
Total fair value of financial assets	338,617	337,531
Recurring | Level 1 | Money market funds
Fair Value Measurements
Total fair value of financial assets	88,625	124,443
Recurring | Level 1 | Cash equivalents
Fair Value Measurements
Total fair value of financial assets	88,625	124,443
Recurring | Level 1 | U.S. government bonds
Fair Value Measurements
Total fair value of financial assets	71,029	84,935
Recurring | Level 1 | Short-term investments
Fair Value Measurements
Total fair value of financial assets	71,029	84,935
Recurring | Level 2 | U.S. government agency bonds
Fair Value Measurements
Total fair value of financial assets	78,587	82,340
Recurring | Level 2 | Corporate debt securities
Fair Value Measurements
Total fair value of financial assets	189,001	170,256
Recurring | Level 2 | Short-term investments
Fair Value Measurements
Total fair value of financial assets	$ 267,588	$ 252,596

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