Royalty and Commercial Payment Purchase Agreements - Summary (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2022	Dec. 31, 2021
Agreements
Long-term royalty and commercial payment receivables	$ 66,049	$ 66,049	$ 69,075
Acquisition of royalty and commercial payment rights	$ 0	$ 0

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