Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financial assets:
Marketable securities	$ 439,139	$ 544,787
Marketable equity security	47
Total financial assets	439,186	544,787
Financial liabilities:
Success payment liabilities	907	1,576
Total financial liabilities	907	1,576
U.S. Treasury securities
Financial assets:
Marketable securities	307,796	374,356
U.S. government agency securities
Financial assets:
Marketable securities	39,571	48,750
Corporate debt securities
Financial assets:
Marketable securities	40,118	59,606
Money market funds
Financial assets:
Money market funds	51,654	62,075
Level 1
Financial assets:
Marketable equity security	47
Total financial assets	51,701	62,075
Financial liabilities:
Success payment liabilities	0	0
Total financial liabilities	0	0
Level 1 | U.S. Treasury securities
Financial assets:
Marketable securities	0	0
Level 1 | U.S. government agency securities
Financial assets:
Marketable securities	0	0
Level 1 | Corporate debt securities
Financial assets:
Marketable securities	0	0
Level 1 | Money market funds
Financial assets:
Money market funds	51,654	62,075
Level 2
Financial assets:
Marketable equity security	0
Total financial assets	387,485	482,712
Financial liabilities:
Success payment liabilities	0	0
Total financial liabilities	0	0
Level 2 | U.S. Treasury securities
Financial assets:
Marketable securities	307,796	374,356
Level 2 | U.S. government agency securities
Financial assets:
Marketable securities	39,571	48,750
Level 2 | Corporate debt securities
Financial assets:
Marketable securities	40,118	59,606
Level 2 | Money market funds
Financial assets:
Money market funds	0	0
Level 3
Financial assets:
Marketable equity security	0
Total financial assets	0	0
Financial liabilities:
Success payment liabilities	907	1,576
Total financial liabilities	907	1,576
Level 3 | U.S. Treasury securities
Financial assets:
Marketable securities	0	0
Level 3 | U.S. government agency securities
Financial assets:
Marketable securities	0	0
Level 3 | Corporate debt securities
Financial assets:
Marketable securities	0	0
Level 3 | Money market funds
Financial assets:
Money market funds	$ 0	$ 0