v3.26.3
INTANGIBLE ASSETS - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 177 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Dec. 31, 2025
Intangible Asset, Finite-Lived [Line Items]            
Payments to date under terms of agreement     $ 71,999 $ 38,918    
Gross carrying amount $ 377,121   377,121   $ 377,121 $ 293,467
Amortization of intangible assets 4,800 $ 15,400 33,500 41,500    
Ligand License Agreement            
Intangible Asset, Finite-Lived [Line Items]            
Payments payable upon achievement of milestones (up to) 114,100   114,100   114,100  
Payments to date under terms of agreement         48,700  
Royalties and milestones capitalized 37,400 $ 15,600 $ 80,800 $ 35,900    
Ligand License Agreement | Minimum            
Intangible Asset, Finite-Lived [Line Items]            
Annual royalty percentage     15.00%      
Ligand License Agreement | Maximum            
Intangible Asset, Finite-Lived [Line Items]            
Annual royalty percentage     17.00%      
Mission License Agreement            
Intangible Asset, Finite-Lived [Line Items]            
Annual royalty percentage     20.00%      
Royalty guarantees, commitments, amount 2,100   $ 2,100   2,100  
Gross carrying amount $ 188,400   $ 188,400   $ 188,400