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Commitments and Contingencies - Additional Information (Details)
$ in Thousands, € in Millions, £ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 08, 2025
USD ($)
May 31, 2026
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
GBP (£)
Jan. 31, 2024
GBP (£)
Feb. 28, 2021
EUR (€)
Gain Contingencies [Line Items]                    
Extended lease term   3 years                
Annual Base Rent   $ 600                
Option to extend the lease   no                
Increase to operating lease right-of-use assets and operating lease liabilities   $ 1,100                
Decrease in operating lease liabilities and corresponding right-of-use asset   $ 300                
Research and development Expense     $ 9,714 $ 6,575   $ 19,087 $ 23,902      
Increase decrease in operating lease liability           5 (109)      
ProBioGen Agreement [Member] | Manufacturing Services [Member]                    
Gain Contingencies [Line Items]                    
Milestone Payment, Amount Reduced     1,200     1,200       € 1.1
Mabworks Agreement [Member]                    
Gain Contingencies [Line Items]                    
Upfront Payment Paid $ 9,000                  
Maximum [Member] | ProBioGen Agreement [Member] | Sales Milestones [Member]                    
Gain Contingencies [Line Items]                    
Milestone Payments     8,000     8,000       7.0
Development Regulatory and Commercial Milestones [Member] | Maximum [Member] | Acelyrin Asset Purchase Agreement [Member]                    
Gain Contingencies [Line Items]                    
Milestone Payments     157,500     157,500        
Development and Regulatory Milestones [Member] | Mabworks Agreement [Member]                    
Gain Contingencies [Line Items]                    
Milestone Payments 30,000                  
Development Regulatory Commercial and Sales Milestones Member] | Maximum [Member] | CRH Agreement [Member]                    
Gain Contingencies [Line Items]                    
Milestone Payments | £               £ 141.4 £ 106.8  
Development Manufacturing and Commercial [Member] | Maximum [Member] | ProBioGen Agreement [Member]                    
Gain Contingencies [Line Items]                    
Milestone Payments     11,400     11,400       € 10.0
Commercial Milestones [Member] | Mabworks Agreement [Member]                    
Gain Contingencies [Line Items]                    
Milestone Payments $ 832,000                  
Milestone [Member] | ProBioGen Agreement [Member]                    
Gain Contingencies [Line Items]                    
Research and development Expense     0 $ 800   0 $ 800      
Milestone [Member] | Mabworks Agreement [Member]                    
Gain Contingencies [Line Items]                    
Research and development Expense     $ 0     $ 0        
Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense | Mabworks Agreement [Member]                    
Gain Contingencies [Line Items]                    
Upfront Payment Paid         $ 9,000