Net Loss Per Share - Computation of Loss Per Share Basic and Diluted (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Net loss available to ordinary shareholders - basic	$ (13,324)	$ (44,821)	$ (98,118)	$ (99,218)
Net loss available to ordinary shareholders - diluted	$ (13,324)	$ (44,821)	$ (98,118)	$ (99,218)
Denominator:
Weighted average ordinary shares outstanding	3,606,107	2,553,179	3,201,051	2,542,394
Assumed exercise of pre-funded warrants	644,591	0	507,970	0
Weighted-average shares outstanding - basic	4,250,698	2,553,179	3,709,021	2,542,394
Weighted-average shares outstanding - diluted	4,250,698	2,553,179	3,709,021	2,542,394
Loss per share - basic	$ (3.13)	$ (17.55)	$ (26.45)	$ (39.03)
Loss per share - diluted	$ (3.13)	$ (17.55)	$ (26.45)	$ (39.03)