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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
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 0
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