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Sale of future royalties (Tables) | 6 Months Ended
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Jun. 30, 2023
Other Liabilities Disclosure [Abstract] |
Schedule of activity related to the net liability from inception of the Agreement | The table below shows the activity related to the net liability for the six months ended June 30, 2023 and 2022:
| Six Months Ended June 30,
| 2023 |  | 2022
| (in thousands)
Net liability related to sale of future royalties - beginning balance | $ | 10,365 |  |  | $ | 16,296 |
Non-cash royalty revenue | (1,944) |  |  | (3,048) |
Non-cash interest expense | 366 |  |  | 985 |
Net liability related to sale of future royalties - ending balance | $ | 8,787 |  |  | $ | 14,233 |

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