Royalty Purchase Agreements (Tables)

12 Months Ended

Dec. 31, 2019

Royalty Purchase Agreements

Summary of Acquisition of Royalty Rights

The following table summarizes the acquisition of royalty rights as of December 31, 2019 (in thousands):

Balance at January 1, 2018	$	—
Acquisition of royalty rights:
Agenus		15,000
Balance at December 31, 2018	$	15,000
Acquisition of royalty rights:
Bioasis		375
Aronora		9,000
Palobiofarma		10,000
Balance at December 31, 2019	$	34,375