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Liability related to sales of future royalties and sales milestones, net (Tables)
 9 Months Ended
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Liability Related Debt Arising Financial Agreement
Changes to the Blackstone Collaboration Agreement liability related to future royalties and sales milestones are as follows:
Amount in thousands
Balance at December 31, 2021$47,016 
Proceeds from Blackstone Development Payments received
70,000 
Interest expense accrued on liability related to future royalties and sales milestones, net
8,005 
Cumulative catch-up adjustment879 
Balance at December 31, 2022$125,900 
Interest expense accrued on liability related to future royalties and sales milestones, net
14,878 
Balance at September 30, 2023
$140,778