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Accrued Expenses and Other Current Liabilities | 9 Months Ended
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Sep. 30, 2019
Payables and Accruals [Abstract] |
Accrued Expenses and Other Current Liabilities | Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consisted of the following:
| As of
| September 30, 2019 |  | December 31, 2018
Bonus | $ | 2,016,001 |  |  | $ | 2,600,839 |
Deferred revenue | 4,112,007 |  |  | 4,159,946 |
Interest payable | 968,018 |  |  | 35,567 |
Lease liability, current portion | 412,436 |  |  | — |
Research and development vendor costs | 517,618 |  |  | 1,446,410 |
Professional fees | 368,218 |  |  | 242,043 |
Vacation | 297,103 |  |  | 294,794 |
Other | 852,659 |  |  | 869,318 |
Accrued expenses and other current liabilities | $ | 9,544,060 |  |  | $ | 9,648,917 |

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- Definition The entire disclosure for accrued liabilities and other current liabilities at the end of the reporting period. + References No definition available. + Details
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