Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financial Assets:
Total financial assets	$ 412,547	$ 336,953
Liabilities:
Total liabilities	73,935	42,700
U.S. government treasury securities
Financial Assets:
Total financial assets	140,072	32,843
U.S. government agency securities
Financial Assets:
Total financial assets	100,328	16,257
Commercial paper
Financial Assets:
Total financial assets	75,717	104,141
Corporate bonds
Financial Assets:
Total financial assets	26,530	33,064
Parapyre Option Obligation
Liabilities:
Total liabilities	13,035
CVR liability
Liabilities:
Total liabilities	60,900	42,700
Level 1
Financial Assets:
Total financial assets	209,972	183,491
Liabilities:
Total liabilities	0	0
Level 1 | U.S. government treasury securities
Financial Assets:
Total financial assets	140,072	32,843
Level 1 | U.S. government agency securities
Financial Assets:
Total financial assets	0	0
Level 1 | Commercial paper
Financial Assets:
Total financial assets	0	0
Level 1 | Corporate bonds
Financial Assets:
Total financial assets	0	0
Level 1 | Parapyre Option Obligation
Liabilities:
Total liabilities	0
Level 1 | CVR liability
Liabilities:
Total liabilities	0	0
Level 2
Financial Assets:
Total financial assets	202,575	153,462
Liabilities:
Total liabilities	13,035	0
Level 2 | U.S. government treasury securities
Financial Assets:
Total financial assets	0	0
Level 2 | U.S. government agency securities
Financial Assets:
Total financial assets	100,328	16,257
Level 2 | Commercial paper
Financial Assets:
Total financial assets	75,717	104,141
Level 2 | Corporate bonds
Financial Assets:
Total financial assets	26,530	33,064
Level 2 | Parapyre Option Obligation
Liabilities:
Total liabilities	13,035
Level 2 | CVR liability
Liabilities:
Total liabilities	0	0
Level 3
Financial Assets:
Total financial assets	0	0
Liabilities:
Total liabilities	60,900	42,700
Level 3 | U.S. government treasury securities
Financial Assets:
Total financial assets	0	0
Level 3 | U.S. government agency securities
Financial Assets:
Total financial assets	0	0
Level 3 | Commercial paper
Financial Assets:
Total financial assets	0	0
Level 3 | Corporate bonds
Financial Assets:
Total financial assets	0	0
Level 3 | Parapyre Option Obligation
Liabilities:
Total liabilities	0
Level 3 | CVR liability
Liabilities:
Total liabilities	60,900	42,700
Money market funds
Financial Assets:
Total financial assets	69,900	150,648
Money market funds | Level 1
Financial Assets:
Total financial assets	69,900	150,648
Money market funds | Level 2
Financial Assets:
Total financial assets	0	0
Money market funds | Level 3
Financial Assets:
Total financial assets	$ 0	$ 0