Net Loss Per Share - Computation of Basic and Diluted Net Loss per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Net Loss Per Share
Net loss - basic and diluted	$ (28,032)	$ (31,479)	$ (26,665)	$ (23,180)	$ (4,206)	$ (27,749)	$ (86,176)	$ (55,135)
Weighted-average common shares outstanding:
Basic	54,235,695			53,726,123			54,038,239	53,616,753
Diluted	54,235,695			53,726,123			54,038,239	53,616,753
Net loss per share:
Basic	$ (0.52)			$ (0.43)			$ (1.59)	$ (1.03)
Diluted	$ (0.52)			$ (0.43)			$ (1.59)	$ (1.03)