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Accrued Expenses (Tables) | 9 Months Ended
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Sep. 30, 2021
Accrued Expenses |
Schedule of accrued expenses | Accrued expenses consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Accrued compensation | ​ | $ | 1,513 | ​ | $ | 1,719
Accrued contracted research costs | ​ | ​ | 1,211 | ​ | ​ | 1,726
Accrued professional fees | ​ | ​ | 612 | ​ | ​ | 356
Accrued other | ​ | ​ | 249 | ​ | ​ | —
Accrued severance | ​ | ​ | — | ​ | ​ | 396
Total | ​ | $ | 3,585 | ​ | $ | 4,197

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