Quarterly report pursuant to Section 13 or 15(d)

Royalty and Commercial Payment Purchase Agreements - LadRx (Details)

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Royalty and Commercial Payment Purchase Agreements - LadRx (Details) - USD ($)
1 Months Ended 3 Months Ended
Jan. 11, 2024
Jun. 21, 2023
Jan. 31, 2024
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Agreements            
Payments of consideration under RPAs, AAAs and CPPAs       $ 15,000,000 $ 9,600,000  
Contingent consideration under RPAs, AAAs and CPPAs       3,000,000   $ 7,000,000
LadRx | Assignment and Assumption Agreement and Royalty Purchase Agreement            
Agreements            
Payments of consideration under RPAs, AAAs and CPPAs $ 1,000,000.0 $ 5,000,000.0 $ 1,000,000.0 1,000,000.0    
Maximum regulatory and commercial sales milestone payments   6,000,000.0        
Maximum commercial sales milestone payments   1,000,000.0        
Acquisition of royalty and commercial payment receivables, Long-Term   6,000,000.0        
Amount of allowance for credit losses       0   0
LadRx | Assignment and Assumption Agreement and Royalty Purchase Agreement | Regulatory milestones            
Agreements            
Contingent consideration, high-end of range   5,000,000.0        
Contingent consideration under RPAs, AAAs and CPPAs   1,000,000.0   $ 0   $ 1,000,000.0
LadRx | Assignment and Assumption Agreement and Royalty Purchase Agreement | Arimoclomol            
Agreements            
Maximum potential regulatory and commercial milestone payments, net   52,500,000        
Maximum payment obligations based on a portion of regulatory and commercial milestone payments   9,500,000        
LadRx | Assignment and Assumption Agreement and Royalty Purchase Agreement | Aldoxorubicin            
Agreements            
Maximum potential regulatory and commercial milestone payments, net   $ 342,700,000