Income Taxes - Components of Income Tax Benefits (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
U.S. federal
Current	$ 4,706,092
Deferred		$ 45,465
U.S. state and local
Current	710,932
Deferred		13,035
Income tax benefit	$ 5,417,024	$ 58,500