Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Accounts Payable And Accrued Liabilities Current [Abstract]
Accrued contract manufacturing	$ 655,207	$ 1,079,314
Accrued contract research and regulatory consulting	418,000	128,678
Accrued precommercial costs	252,125	85,000
Accrued payroll and payroll taxes	153,238	1,302,728
Accrued legal	152,340	111,543
Accrued accounting, audit, and tax fees	147,850	102,000
Accrued consulting	109,073	49,940
Accrued miscellaneous expenses	56,598	119,861
Accrued license fees		1,567,368
Total accrued expenses	$ 1,944,431	$ 4,546,432