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Accrued Expenses | 12 Months Ended
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Dec. 31, 2022
Payables and Accruals [Abstract] |
Accrued Expenses | 7. Accrued Expenses Accrued expenses consisted of the following:
|  | December 31, |
|  | 2022 |  |  | 2021 |
|  | (in thousands) |
External research and development |  | $ | 8,424 |  |  | $ | 5,666 |
Payroll and employee related expenses |  |  | 15,231 |  |  |  | 4,280 |
Manufacturing |  |  | 4,596 |  |  |  | — |
Accrued consulting and other professional fees |  |  | 4,116 |  |  |  | 2,820 |
Rebates and other GTN adjustments |  |  | 3,582 |  |  |  | — |
Royalty payable |  |  | 1,358 |  |  |  | — |
Other accrued expenses |  |  | 1,005 |  |  |  | 258 |
Total accrued expenses |  | $ | 38,312 |  |  | $ | 13,024 |

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