Stock-Based Compensation - Schedule of Assumptions Used in Black-Scholes Option-Pricing Model to Determine Grant-date Fair Value of Stock Options Granted (Detail)			3 Months Ended		9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate (in percentage)			3.80%	4.20%	4.10%	4.00%
Expected term (in years)			6 years 1 month 6 days	6 years 1 month 6 days	6 years 1 month 6 days	6 years
Expected volatility (in percentage)			101.40%	94.70%	97.60%	93.50%
Expected dividend yield (in percentage)			0.00%	0.00%	0.00%	0.00%
Class C Warrant Liability
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate (in percentage)	3.60%	3.90%
Expected term (in years)	3 years 2 months 12 days	3 years 10 months 24 days
Expected volatility (in percentage)	103.50%	96.20%
Expected dividend yield (in percentage)	0.00%	0.00%