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Collaboration Agreements - Schedule of Cost Sharing Payments and Reimbursements (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Net cost sharing payments (reimbursements) $ 511 $ 2,780 $ 2,757 $ 5,798  
Other accrued costs and current liabilities 78,276   78,276   $ 97,846
Takeda Pharmaceutical Company Limited          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Net cost sharing payments (reimbursements) (1,513) (1,449) (3,130) (3,082)  
Takeda Pharmaceutical Company Limited | Collaborative Arrangement, PTV:PGRN          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Net cost sharing payments (reimbursements) (1,513) (1,439) (3,130) (2,935)  
Takeda Pharmaceutical Company Limited | Collaborative Arrangement, ATV:TREM2          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Net cost sharing payments (reimbursements) 0 (10) 0 (147)  
Takeda Pharmaceutical Company Limited | Collaborative Arrangement, PTV:PGRN and ATV:TREM2          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Receivable 1,500   1,500   1,600
Biogen | LRRK2 Product          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Net cost sharing payments (reimbursements) 2,024 $ 4,229 5,887 $ 8,880  
Biogen | Biogen Collaborative Arrangement          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Other accrued costs and current liabilities $ 2,000   $ 2,000   $ 2,800