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Basis of Presentation and Summary of Significant Accounting Policies - Segment Profit or Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Revenue, Major Customer        
Total revenues and other income $ 47,627 $ 41,531 $ 92,960 $ 72,509
Share-based compensation     (17,833) (18,394)
Other segment items:        
Amortization of intangibles (8,258) (8,257) (16,515) (16,443)
Interest expense (1,153) (1,268) (2,020) (1,411)
Net income (loss) 8,444 (19,100) (27,772) (16,112)
Other expense items, net 16,500 11,300 77,000 20,300
Fair value adjustment   31,600   31,600
Castle Creek Investment        
Other segment items:        
Recognized research and development expense 44,300   44,300  
Income from financial royalty assets        
Revenue, Major Customer        
Total revenues and other income 6,313 559 12,215 1,297
Other segment items:        
Other expense items, net       26,500
Financial royalty assets impairment   26,500    
Development and Licensing of Biopharmaceutical Assets        
Revenue, Major Customer        
Total revenues and other income 47,627 41,531 92,960 72,509
Share-based compensation (9,997) (11,060) (17,833) (18,394)
Other segment items:        
Amortization of intangibles (8,258) (8,257) (16,515) (16,443)
Depreciation of property and equipment (264) (596) (777) (1,175)
Interest income 1,621 2,757 3,392 4,777
Interest expense (1,153) (1,268) (2,020) (1,411)
Other (24,729) (75,018) (96,811) (5,635)
Net income (loss) $ 4,847 $ (51,911) $ (37,604) $ 34,228