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Collaboration Agreements - Schedule of Cost Sharing Payments and Reimbursements (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Net cost sharing payments (reimbursements) $ 2,246 $ 2,988  
Other accrued costs and current liabilities 69,776   $ 97,846
Takeda Pharmaceutical Company Limited      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Net cost sharing payments (reimbursements) (1,617) (1,663)  
Takeda Pharmaceutical Company Limited | Collaborative Arrangement, PTV:PGRN      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Net cost sharing payments (reimbursements) (1,617) (1,511)  
Takeda Pharmaceutical Company Limited | Collaborative Arrangement, ATV:TREM2      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Net cost sharing payments (reimbursements) 0 (152)  
Takeda Pharmaceutical Company Limited | Collaborative Arrangement, PTV:PGRN and ATV:TREM2      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Receivable 1,600   1,600
Biogen | LRRK2 Product      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Net cost sharing payments (reimbursements) 3,863 $ 4,651  
Biogen | Biogen Collaborative Arrangement      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Other accrued costs and current liabilities $ 3,900   $ 2,800