Leases - Additional Information (Details)	1 Months Ended		3 Months Ended
	Sep. 30, 2023 USD ($)	Jan. 31, 2021 renewalOption	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Oct. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Lessee Lease Description [Line Items]
Operating lease right-of-use assets			$ 28,905,000		$ 30,997,000
Total lease liabilities			27,420,000
Operating lease rent expense recognized			2,700,000	$ 1,900,000
New Corporate Headquarters Facility
Lessee Lease Description [Line Items]
Number of renewal options | renewalOption		2
Operating lease, renewal term		60 months
Operating lease, extended term		60 days
San Carlos
Lessee Lease Description [Line Items]
Operating lease right-of-use assets							$ 28,400,000
Total lease liabilities							$ 12,900,000
Lonza Commercial Manufacturing and Supply Agreement
Lessee Lease Description [Line Items]
Operating lease right-of-use assets					0
Total lease liabilities					$ 0
Operating lease rent expense recognized			$ 0
Assignment Agreement
Lessee Lease Description [Line Items]
Operating lease right-of-use assets						$ 16,700,000
Total lease liabilities						$ 16,800,000
Operating lease, agreement term			10 years
Assumed lease rental payment	$ 1,900,000
Operating lease, rent adjustment percentage			0.03