Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Accounts Payable And Accrued Liabilities Current [Abstract]
Accrued legal	$ 174,592	$ 21,477
Accrued pre-commercial costs	341,159
Accrued consulting	102,156	13,105
Accrued audit and tax	111,250	39,820
Accrued license fees	817,578	205,444
Accrued contract manufacturing	218,108	126,700
Accrued contract research	99,140	16,800
Accrued miscellaneous expenses	73,348	14,682
Accrued expenses	$ 1,937,331	$ 438,028