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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Net cost sharing payments (reimbursements) $ 2,780 $ 3,087 $ 5,798 $ 6,163  
Accounts payable 10,844   10,844   $ 11,137
Takeda Pharmaceutical Company Limited          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Net cost sharing payments (reimbursements) (1,449) (1,353) (3,082) (3,066)  
Takeda Pharmaceutical Company Limited | Collaborative Arrangement, PTV:PGRN          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Net cost sharing payments (reimbursements) (1,439) (1,138) (2,935) (2,338)  
Takeda Pharmaceutical Company Limited | Collaborative Arrangement, ATV:TREM2          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Net cost sharing payments (reimbursements) (10) (215) (147) (728)  
Takeda Pharmaceutical Company Limited | Collaborative Arrangement, PTV:PGRN and ATV:TREM2          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Receivable 1,400   1,400   1,500
Biogen | LRRK2 Product          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Net cost sharing payments (reimbursements) 4,229 $ 4,440 8,880 $ 9,229  
Biogen | Biogen Collaborative Arrangement          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Accounts payable $ 4,200   $ 4,200   $ 2,500