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Net Loss Per Ordinary Share - Computation of Basic and Diluted Loss Per Ordinary Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2023
Apr. 30, 2023
Jul. 31, 2022
Apr. 30, 2022
Jul. 31, 2023
Jul. 31, 2022
Numerator:            
Net loss $ (31,198) $ (35,902) $ (23,650) $ (10,822) $ (67,100) $ (34,472)
Denominator:            
Weighted-average ordinary shares - basic 39,736,704   38,258,341   39,538,748 37,986,839
Weighted-average ordinary shares - diluted 39,736,704   38,258,341   39,538,748 37,986,839
Net loss per ordinary share:            
Basic $ (0.79)   $ (0.62)   $ (1.7) $ (0.91)
Diluted $ (0.79)   $ (0.62)   $ (1.7) $ (0.91)