Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financial Assets:
Total financial assets	$ 482,886	$ 336,953
Liabilities:
Total liabilities	47,149	42,700
U.S. government treasury securities
Financial Assets:
Total financial assets	85,045	32,843
U.S. government agency securities
Financial Assets:
Total financial assets	55,818	16,257
Commercial paper
Financial Assets:
Total financial assets	74,792	104,141
Corporate bonds
Financial Assets:
Total financial assets	41,434	33,064
Parapyre Option Obligation
Liabilities:
Total liabilities	5,449
CVR liability
Liabilities:
Total liabilities	41,700	42,700
Level 1
Financial Assets:
Total financial assets	310,842	183,491
Liabilities:
Total liabilities	0	0
Level 1 | U.S. government treasury securities
Financial Assets:
Total financial assets	85,045	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	172,044	153,462
Liabilities:
Total liabilities	5,449	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	55,818	16,257
Level 2 | Commercial paper
Financial Assets:
Total financial assets	74,792	104,141
Level 2 | Corporate bonds
Financial Assets:
Total financial assets	41,434	33,064
Level 2 | Parapyre Option Obligation
Liabilities:
Total liabilities	5,449
Level 2 | CVR liability
Liabilities:
Total liabilities	0	0
Level 3
Financial Assets:
Total financial assets	0	0
Liabilities:
Total liabilities	41,700	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	41,700	42,700
Money market funds
Financial Assets:
Total financial assets	225,797	150,648
Money market funds | Level 1
Financial Assets:
Total financial assets	225,797	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