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Net Loss Per Ordinary Share - Computation of Basic and Diluted Net Loss Per Ordinary Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2025
Apr. 30, 2025
Jul. 31, 2024
Apr. 30, 2024
Jul. 31, 2025
Jul. 31, 2024
Numerator:            
Net loss $ (19,995) $ (24,328) $ (34,889) $ (37,932) $ (44,323) $ (72,821)
Denominator:            
Weighted-average ordinary shares - basic 42,546,979   41,129,754   42,383,475 40,952,373
Weighted-average ordinary shares - diluted 42,546,979   41,129,754   42,383,475 40,952,373
Net loss per ordinary share:            
Basic $ (0.47)   $ (0.85)   $ (1.05) $ (1.78)
Diluted $ (0.47)   $ (0.85)   $ (1.05) $ (1.78)