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Collaboration and License Agreements - Additional Information (Details) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 08, 2023	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($) program	Dec. 31, 2020 program	Dec. 31, 2022 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Number of programs the collaboration to focus on \| program							3
Accrued and other liabilities		$ 146,111		$ 146,111				$ 489,090
Research and development		148,253	$ 114,166	477,756	$ 319,475
Total unrecognized transaction price		53,207		53,207				$ 53,207
2020 GSK
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Payments to GSK		67,000		340,500
Accrued and other liabilities		900		900
Research and development		6,100	10,400	18,600	24,000
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
Option exercise fee to be received						$ 300,000
2021 Collaboration Agreement \| 2021 GSK \| Maximum
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Pre-defined regulatory milestone payment						$ 200,000
2021 GSK Collaboration
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Research and development		600	$ 300	1,900	$ 1,300
Percentage of share development costs						50.00%
Percentage of share Profit and loss						50.00%
Total unrecognized transaction price		$ 51,700		$ 51,700