Income Taxes - Schedule of Reconciliation of Federal Statutory Rate on Loss before Income Taxes and before Gain from Sale of Equity Method Investment Rate to Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Statutory federal tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal income tax benefit	(0.60%)	(2.40%)	(4.20%)
Increase in valuation allowance	7.40%	14.50%	9.20%
Permanent items	(8.50%)	(13.80%)	(17.90%)
Tax credits	(5.90%)	(9.90%)	(5.70%)
Provision vs. tax return differences	(1.90%)	2.10%	(2.00%)
Foreign rate differential and deferred items	0.10%	(0.20%)	0.00%
Other	(0.60%)	0.10%	(0.10%)
Effective income tax rate	11.00%	11.40%	0.30%