Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Payables And Accruals [Abstract]
Accounts payable	$ 1,062,243	$ 595,680
Professional fees	460,869	487,923
Accrued bonus	221,712	1,877,455
Accrued vacation	126,096	90,663
Accrued project costs	1,812,594	2,232,014
Other	50,498	173,182
Total accounts payable and accrued expenses	$ 3,734,012	$ 5,456,917