Royalty and Commercial Payment Purchase Agreements - EIR Method - Aptevo (Details) - USD ($)			1 Months Ended			12 Months Ended
	Oct. 01, 2024	Apr. 01, 2024	Mar. 31, 2025	Mar. 31, 2023	Oct. 31, 2021	Dec. 31, 2025	Dec. 31, 2024
Agreements
Acquisition of royalty and commercial payment receivables						$ 4,395,000	$ 45,000,000
Payments of consideration under RPAs, AAAs and CPPAs						8,000,000	53,000,000
Contingent consideration under RPAs, AAAs, and CPPAs						0	3,000,000
Reclassification of royalty and commercial payment receivables from the cost recovery to the EIR method, EIR method						2,874,000	14,976,000
Income from purchased receivables under the EIR method						26,745,000	15,066,000
Receipts under RPAs, AAAs, and CPPAs						3,300,000	29,248,000
Royalty and commercial payment receivables under the EIR method						27,213,000	19,733,000
Short-term royalty and commercial payment receivables under the cost recovery method						0	413,000
Aptevo
Agreements
Reclassification of royalty and commercial payment receivables from the cost recovery to the EIR method, EIR method	$ 7,200,000						7,181,000
Income from purchased receivables under the EIR method						1,000,000	266,000
Royalty and commercial payment receivables under the EIR method							6,628,000
Aptevo | Commercial Payment Purchase Agreement
Agreements
Maximum milestone payments entitled to receive				$ 5,300,000
Acquisition of royalty and commercial payment receivables				9,700,000
Payments of consideration under RPAs, AAAs and CPPAs				9,600,000
Maximum commercial sales milestone payments				50,000
Commercial payments attributable to net sales threshold				$ 500,000
Receipts under RPAs, AAAs, and CPPAs						1,700,000
Allowance for credit losses						0	0
Affitech
Agreements
Reclassification of royalty and commercial payment receivables from the cost recovery to the EIR method, EIR method							7,795,000
Income from purchased receivables under the EIR method							14,800,000
Royalty and commercial payment receivables under the EIR method							13,105,000
Affitech | Commercial Payment Purchase Agreement
Agreements
Acquisition of royalty and commercial payment receivables					$ 14,000,000
Payments of consideration under RPAs, AAAs and CPPAs			$ 6,000,000		6,000,000
Maximum commercial sales milestone payments					$ 12,000,000
Reclassification of royalty and commercial payment receivables from the cost recovery to the EIR method, EIR method		$ 7,800,000
Income from purchased receivables under the EIR method						24,000,000	14,800,000
Receipts under RPAs, AAAs, and CPPAs						22,500,000
Allowance for credit losses						$ 0	$ 0