Summary of Accrued Liabilities (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Payables And Accruals [Abstract]
Accrued employee bonuses	$ 1,407,730	$ 3,049,109
Payroll and employee benefit accruals	607,580	369,275
Accrued professional fees	130,190	101,150
Accrued interest	130,509	45,544
Other accrued liabilities	254,606	181,708
Total accrued liabilities	$ 2,530,615	$ 3,746,786