Quarterly report pursuant to Section 13 or 15(d)

Royalty and Commercial Payment Purchase Agreements - Aptevo (Details)

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Royalty and Commercial Payment Purchase Agreements - Aptevo (Details) - USD ($)
 1 Months Ended 6 Months Ended 12 Months Ended
Mar. 29, 2023
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Agreements          
Payments of consideration under RPAs, AAAs and CPPAs     $ 37,000,000 $ 14,650,000  
Contingent consideration under RPAs, AAAs and CPPAs     3,000,000   $ 7,000,000
Receipts under RPAs, AAAs and CPPAs     16,741,000 $ 2,934,000  
Short-term royalty and commercial payment receivables     14,257,000   14,215,000
Aptevo | Commercial Payment Purchase Agreement          
Agreements          
Maximum milestone payments entitled to receive $ 5,300,000        
Acquisition of royalty and commercial payment receivables, Long-Term 9,700,000        
Payments of consideration under RPAs, AAAs and CPPAs 9,600,000 $ 50,000      
Maximum commercial sales milestone payments 50,000        
Commercial payments attributable to net sales threshold 500,000        
Contingent consideration under RPAs, AAAs and CPPAs $ 50,000        
Receipts under RPAs, AAAs and CPPAs     800,000   1,700,000
Short-term royalty and commercial payment receivables     1,900,000   2,000,000.0
Amount of allowance for credit losses     $ 0   $ 0
Aptevo | Commercial Payment Purchase Agreement | Minimum          
Agreements          
Receipts under RPAs, AAAs and CPPAs   $ 500,000