Restructuring - Additional Information (Detail) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Nov. 02, 2023 Employee	Nov. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Restructuring Cost and Reserve [Line Items]
Workforce reduction rate	41.00%
Number of positions eliminated | Employee	160
Restructuring Charges							$ 5,606
Stock-based compensation expense			$ 5,183	$ 8,673	$ 17,206	$ 29,015
Restricted Stock Units [Member]
Restructuring Cost and Reserve [Line Items]
Stock-based compensation expense		$ 1,255
Severance and other employee costs
Restructuring Cost and Reserve [Line Items]
Restructuring Charges							5,345
Acceleration of unvested equity awards
Restructuring Cost and Reserve [Line Items]
Restructuring Charges							$ 261