Accrued Expenses

12 Months Ended

Dec. 31, 2018

Payables And Accruals [Abstract]

Accrued Expenses

7. Accrued Expenses

Accrued expenses consist of the following:

	As of December 31,
	2018		2017
Accrued professional services	$	552,619	$	835,326
Accrued payroll and employee benefits		1,257,191		909,455
Accrued interest		1,192		536
Accrued construction costs		—		328,384
Accrued research and development		2,076,704		1,551,556
Deferred Revenue		19,753		19,753
Deferred Rent		175,490		15,914
Accrued expenses	$	4,082,949	$	3,660,924