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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Bonus $ 893,888 $ 2,538,340
Accrued interest 936,695 87,955
Professional fees 372,204 381,980
Vacation 393,214 328,588
Other (primarily R&D vendors and CMOs) 692,436 889,398
Accrued expenses and other current liabilities $ 3,288,437 $ 4,226,261