Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Accounts Payable And Accrued Liabilities Current [Abstract]
Accrued contract manufacturing	$ 1,254,270	$ 1,479,771
Accrued payroll and payroll taxes	353,257	267,159
Accrued consulting	140,938	88,750
Accrued accounting, audit, and tax fees	120,218	181,200
Accrued license fees	87,984	240,041
Accrued legal	64,863	350,517
Accrued miscellaneous expenses	34,985	102,999
Accrued contract research and regulatory consulting	27,500	1,070,664
Total accrued expenses	$ 2,084,015	$ 3,781,101