Summary of Accrued Liabilities (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Payables And Accruals [Abstract]
Accrued employee bonuses	$ 3,049,109	$ 954,120
Payroll and employee benefit accruals	369,275	308,186
Accrued professional fees	101,150	79,029
Accrued interest	45,544	82,591
Other accrued liabilities	181,708	246,360
Total accrued liabilities	$ 3,746,786	$ 1,670,286