License Agreements (Additional Information) (Details) $ in Thousands, £ in Millions	Mar. 31, 2025 USD ($)	Mar. 31, 2025 GBP (£)	Jan. 08, 2025 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Direct transaction costs	$ 100
Research And License Agreement Upfront Payment Due	9,000
Acelyrin Inc. [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone Payments	157,500
CRH Agreement [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone Payments	138,100	£ 106.8
ProBioGen Agreement [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone Payments	10,800	10.0
ProBioGen Agreement [Member] | ProBioGen Manufacturing Service [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone Payment, Amount Reduced	1,100	1.1
ProBioGen Agreement [Member] | ProBioGen Sales Milestones [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone Payments	7,600	£ 7.0
Mabworks Agreement [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone Payments	$ 0		$ 832,000
Research And License Agreement Upfront Payment Due			9,000
Total Development And Regulatory Milestones			$ 30,000