Federal Income Tax Provision Compared With Statutory Rates (Detail)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Statutory regular federal income tax rate	(21.00%)	(21.00%)	(21.00%)
Change in valuation allowance	21.90%	(92.80%)	34.20%
State tax benefit (net of federal benefit)	(4.00%)	(3.90%)	(4.80%)
Research credits	0.00%	0.00%	(0.60%)
Foreign amounts with no tax benefit	0.10%	0.10%	0.00%
Non-deductible expenses	2.40%	0.60%	(4.20%)
Effect of change in rate	(0.40%)	4.50%	0.00%
Expired net operating loss carryforwards	0.00%	0.00%	0.00%
Net operating loss 382 write-offs	0.00%	113.40%	0.00%
Effect of prior year true-ups	0.10%	(1.20%)	(4.30%)
Other	1.00%	0.60%	1.10%
Total	0.10%	0.30%	0.40%