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Accrued Expenses (Tables) | 6 Months Ended
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Jun. 30, 2020
Accrued Expenses |
Summary of Accrued Expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, | ​ | December 31, |
​ | ​ | 2020 | ​ | 2019 |
Accrued research and development expenses | ​ | $ | 4,241,613 | ​ | $ | 5,149,697 | ​
Accrued bonuses | ​ | ​ | 2,035,080 | ​ | ​ | 2,677,288 | ​
Accrued consulting and other professional fees | ​ |  | 354,465 | ​ |  | 320,935 | ​
Accrued employee benefits | ​ |  | 694,718 | ​ |  | 351,966 | ​
Other accrued expenses | ​ |  | 153,917 | ​ |  | 210,904 | ​
Accrued expenses | ​ | $ | 7,479,793 | ​ | $ | 8,710,790 | ​

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