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Liability related to sales of future royalties and sales milestones, net (Tables) | 9 Months Ended
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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 adjustment |  | 879 |
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 |

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