Annual report pursuant to Section 13 and 15(d)

Royalty and Commercial Payment Purchase Agreements - Summary of Acquisition of Royalty Rights (Details)

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Royalty and Commercial Payment Purchase Agreements - Summary of Acquisition of Royalty Rights (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Agreements    
Balance at beginning of period $ 34,575 $ 34,375
Balance at end of period 69,075 34,575
Agenus [Member]    
Agreements    
Cash receipts for achievement of contractual milestones   (1,000)
Bioasis    
Agreements    
Acquisition of royalty rights   $ 1,200
Viracta    
Agreements    
Acquisition of royalty and commercial payment rights 13,500  
Kuros    
Agreements    
Acquisition of royalty and commercial payment rights 7,000  
Affitech    
Agreements    
Acquisition of royalty and commercial payment rights $ 14,000