Net Loss Per Ordinary Share - Computation of Basic and Diluted Loss Per Ordinary Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Oct. 31, 2024	Jul. 31, 2024	Apr. 30, 2024	Oct. 31, 2023	Jul. 31, 2023	Apr. 30, 2023	Oct. 31, 2024	Oct. 31, 2023
Numerator:
Net loss	$ (24,071)	$ (34,889)	$ (37,932)	$ (41,710)	$ (31,198)	$ (35,902)	$ (96,892)	$ (108,810)
Denominator:
Weighted-average ordinary shares - basic	41,479,459			40,053,251			41,128,068	39,710,248
Weighted-average ordinary shares - diluted	41,479,459			40,053,251			41,128,068	39,710,248
Net loss per ordinary share:
Basic	$ (0.58)			$ (1.04)			$ (2.36)	$ (2.74)
Diluted	$ (0.58)			$ (1.04)			$ (2.36)	$ (2.74)