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, 2022	Apr. 30, 2022	Jul. 31, 2021	Apr. 30, 2021	Jul. 31, 2022	Jul. 31, 2021
Numerator:
Net loss	$ (23,650)	$ (10,822)	$ (7,156)	$ (10,818)	$ (34,472)	$ (17,974)
Denominator:
Weighted-average ordinary shares - basic	38,258,341		36,442,536		37,986,839	36,191,420
Weighted-average ordinary shares - diluted	38,258,341		36,442,536		37,986,839	36,191,420
Net loss per ordinary share:
Basic	$ (0.62)		$ (0.20)		$ (0.91)	$ (0.50)
Diluted	$ (0.62)		$ (0.20)		$ (0.91)	$ (0.50)

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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