Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Accounts Payable And Accrued Liabilities Current [Abstract]
Accrued contract manufacturing	$ 1,128,870	$ 1,479,771
Accrued payroll and payroll taxes	322,612	267,159
Accrued contract research and regulatory consulting	245,645	1,070,664
Accrued consulting	154,448	88,750
Accrued legal	148,508	350,517
Accrued accounting, audit, and tax fees	88,471	181,200
Accrued license fees	84,001	240,041
Accrued miscellaneous expenses	53,870	102,999
Total accrued expenses	$ 2,226,425	$ 3,781,101