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Accrued Expenses and Other Current Liabilities (Tables)
9 Months Ended
Sep. 30, 2019
Payables and Accruals [Abstract]  
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