Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Payables And Accruals [Abstract]
Accounts payable	$ 523,037	$ 439,785
Accrued bonus	428,683	689,830
Professional fees	444,534	346,999
Accrued project costs	328,463	382,131
Accrued vacation	48,107	43,470
Restructuring accrual (see Note 15)		793,913
Accrued retention bonus		521,859
Other	26,547	13,463
Total accounts payable and accrued expenses	$ 1,799,371	$ 3,231,450