Income Taxes - Income Tax Rate Reconciliation (Detail)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Federal statutory tax rate	21.00%	21.00%	21.00%
State income taxes, net of Federal income tax benefit	6.00%	6.00%	8.00%
Nondeductible expenses	3.00%	4.00%	6.00%
Research credit, Federal benefit	(3.00%)	(2.00%)	(3.00%)
Stock-based compensation	0.00%	(1.00%)	(7.00%)
Remeasurement of state deferred tax liabilities	0.00%	0.00%	(2.00%)
Uncertain Tax Position	1.00%	0.00%	0.00%
Effective income tax rate	28.00%	28.00%	23.00%