Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expense and Other Current Liabilities (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Accrued Liabilities And Other Liabilities [Abstract]
Accrued professional services	$ 1,350,194	$ 429,467
Accrued payroll and employee benefits	2,351,599	1,183,130
Accrued interest	13,016	5,047
Accrued research and development	7,316,876	1,966,111
Lease obligation, current portion (see Note 6)	$ 356,716	$ 259,449
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherCurrentLiabilitiesMember	us-gaap:OtherCurrentLiabilitiesMember
Deferred revenue	$ 19,753	$ 61,563
Total accrued expenses	$ 11,408,154	$ 3,904,767