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Accrued Expenses and Other Current Liabilities | 9 Months Ended
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Sep. 30, 2023
Accrued Expenses and Other Current Liabilities |
Accrued Expenses and Other Current Liabilities | 7. Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | September 30, 2023 |  | December 31, 2022
Professional fees | ​ | $ | 418 | ​ | $ | 602
Compensation and related benefits | ​ |  | 6,232 | ​ |  | 8,446
Research and development | ​ |  | 3,063 | ​ |  | 1,878
Property and equipment | ​ | ​ | — | ​ | ​ | 85
Amount due to Catalent in connection with Letter Agreements | ​ |  | 4,000 | ​ |  | —
​ | ​ | $ | 13,713 | ​ | $ | 11,011
​

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