Net Loss Per Ordinary Share - Computation of Basic and Diluted Net Loss Per Ordinary Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Numerator:
Net loss	$ (26,411)	$ (59,786)	$ (44,792)
Denominator:
Weighted-average ordinary shares - basic	36,577,120	34,679,717	33,083,562
Weighted-average ordinary shares - diluted	36,577,120	34,679,717	33,083,562
Net loss per ordinary share:
Basic	$ (0.72)	$ (1.72)	$ (1.35)
Diluted	$ (0.72)	$ (1.72)	$ (1.35)