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Accrued Expenses (Tables) | 9 Months Ended
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Sep. 30, 2020
Accrued Expenses |
Summary of Accrued Expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, | ​ | December 31, |
​ | ​ | 2020 | ​ | 2019 |
Accrued research and development expenses | ​ | $ | 4,151,902 | ​ | $ | 5,149,697 | ​
Accrued bonuses | ​ | ​ | 2,348,091 | ​ | ​ | 2,677,288 | ​
Accrued consulting and other professional fees | ​ |  | 348,798 | ​ |  | 320,935 | ​
Accrued employee benefits | ​ |  | 760,824 | ​ |  | 351,966 | ​
Other accrued expenses | ​ |  | 260,972 | ​ |  | 210,904 | ​
Accrued expenses | ​ | $ | 7,870,587 | ​ | $ | 8,710,790 | ​

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