Commitments and Contingent Liabilities - Narrative (Details)	1 Months Ended		3 Months Ended		12 Months Ended
	Nov. 30, 2023 USD ($)	Jan. 31, 2023 USD ($) ft²	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2023 USD ($)
Other Commitments [Line Items]
Research and development			$ 58,032,000	$ 167,920,000
Unrecorded unconditional purchase obligation			117,700,000			$ 142,300,000
Office space leased (in square feet) | ft²		10,012
Term of contract				65 months
Renewal term		3 years
Monthly payments		$ 30,500
Annual rent increase		3.00%
Rent abatement, term		6 months
Security deposit			34,000
Operating lease right-of-use asset		$ 1,300,000	1,149,000			1,195,000
Operating lease liability, non-current		$ 1,300,000	1,134,000			$ 1,194,000
Operating lease costs (less than)			$ 100,000	$ 100,000
Weighted average remaining lease term			53 months
Discount rate			12.00%
Lease liability measurement (less than)			$ 100,000
Affibody | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Other Commitments [Line Items]
Research and development	$ 15,000,000.0				$ 25,000,000