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v3.20.4

Accrued Expenses (Tables) | 12 Months Ended
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Dec. 31, 2020
Accrued Expenses |
Summary of accrued expenses | At December 31, 2020 and 2019, accrued expenses consist of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of
​ | ​ | December 31, |  | December 31,
​ |  | 2020 | ​ | 2019
Accrued payroll and related expenses | ​ | $ | 6,663 | ​ | $ | 4,380
Accrued external research and development expense | ​ | ​ | 5,387 | ​ | ​ | 4,088
Accrued payable for property and equipment | ​ | ​ | 1,291 | ​ | ​ | —
Accrued professional and consulting expense | ​ | ​ | 1,141 | ​ | ​ | 929
Accrued other | ​ |  | 476 | ​ |  | 213
​ | ​ | $ | 14,958 | ​ | $ | 9,610

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