Royalty and Commercial Payment Purchase Agreements - Summary (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Agreements
Long-term royalty and commercial payment receivables	$ 69,075	$ 69,075
Acquisition of royalty and commercial payment rights	0
Cash receipts for achievement of contractual milestones	$ 0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration