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Accrued Expenses (Tables) | 9 Months Ended
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Sep. 30, 2023
Accrued Expenses |
Schedule of accrued expenses | Accrued expenses consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
​ |  | 2023 |  | 2022
Accrued contracted costs | ​ | $ | 2,863 | ​ | $ | 2,822
Accrued compensation | ​ | ​ | 2,671 | ​ | ​ | 3,373
Accrued professional fees | ​ | ​ | 1,891 | ​ | ​ | 588
Accrued other | ​ | ​ | 331 | ​ | ​ | 407
Accrued milestones | ​ | ​ | — | ​ | ​ | 500
Total | ​ | $ | 7,756 | ​ | $ | 7,690
​

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