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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, 2022
Investments, Debt and Equity Securities [Abstract] |
Liability Related to Sale of Revenue | The following table shows the activity within the liability related to the sale of future royalties and sales milestones for the nine-month period ended September 30, 2022 (in thousands):
|  | Liability related to sales of future royalties and sales milestones, net
Balance as of December 31, 2021 |  | $ | 47,016 |
Non-cash interest expense on liability related to sale of future royalties and sales milestones | 5,427 |
Balance as of September 30, 2022 |  | $ | 52,443 |

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