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Accrued Expenses (Tables) | 6 Months Ended
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Jun. 30, 2021
Accrued Expenses |
Schedule of accrued expenses | Accrued expenses consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Accrued compensation | ​ | $ | 1,018 | ​ | $ | 1,719
Accrued contracted research costs | ​ | ​ | 790 | ​ | ​ | 1,726
Accrued professional fees | ​ | ​ | 663 | ​ | ​ | 356
Accrued other | ​ | ​ | 180 | ​ | ​ | —
Accrued severance | ​ | ​ | 63 | ​ | ​ | 396
Total | ​ | $ | 2,714 | ​ | $ | 4,197

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