Royalty Purchase Agreements (Tables)

12 Months Ended

Dec. 31, 2020

Royalty Purchase Agreements

Summary of Acquisition of Royalty Rights

The following table summarizes the long-term royalty receivable activities including acquisitions of royalty rights and cash receipts for achievement of contractual milestones during the years ended December 31, 2020 and 2019 (in thousands):

Balance at January 1, 2019	$	15,000
Acquisition of royalty rights:
Bioasis		375
Aronora		9,000
Palobiofarma		10,000
Balance at December 31, 2019	$	34,375
Acquisition of royalty rights:
Bioasis		1,200
Cash receipts for achievement of contractual milestones:
Agenus		(1,000)
Balance at December 31, 2020	$	34,575