Summary of Accrued Liabilities (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Payables And Accruals [Abstract]
Accrued employee bonuses	$ 867,628	$ 3,049,109
Payroll and employee benefit accruals	483,882	369,275
Accrued professional fees	97,562	101,150
Accrued interest	41,464	45,544
Other accrued liabilities	190,647	181,708
Total accrued liabilities	$ 1,681,183	$ 3,746,786