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Collaboration and License Agreements - Additional Information (Details) $ in Thousands			3 Months Ended		12 Months Ended
	Feb. 21, 2024	Feb. 08, 2023	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2021 program
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Liability balance for the share of the remaining manufacturing expenses			$ 72,260		$ 104,220
Research and development			100,125	$ 157,643
Total revenues			56,376	62,957
Contract revenue
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Total revenues			52,191	138
2020 GSK
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Payments to GSK					$ 341,400
Liability balance for the share of the remaining manufacturing expenses			700
Research and development			2,800	$ 7,300
Preliminary Collaboration Agreement \| 2020 GSK \| Antibody Program
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Percentage of development costs		72.50%
2021 Collaboration Agreement \| 2021 GSK
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Number of separate programs \| program						3
2021 GSK Collaboration
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Percentage of share development costs	50.00%
Percentage of share profit and loss	50.00%
2021 GSK Collaboration \| Contract revenue
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Total revenues			$ 51,700