Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Accounts Payable And Accrued Liabilities Current [Abstract]
Accrued contract research and regulatory consulting	$ 433,251	$ 1,070,664
Accrued payroll and payroll taxes	360,589	267,159
Accrued consulting	282,339	88,750
Accrued accounting, audit, and tax fees	148,000	181,200
Accrued contract manufacturing	98,050	1,479,771
Accrued license fees	77,704	240,041
Accrued legal	73,675	350,517
Accrued miscellaneous expenses	25,679	102,999
Total accrued expenses	$ 1,499,287	$ 3,781,101