Net Loss Per Share - Computation of Loss Per Share Basic and Diluted (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net loss available to ordinary shareholders - basic	$ (45,926)	$ (27,105)	$ (84,794)	$ (54,397)
Net loss available to ordinary shareholders - diluted	$ (45,926)	$ (33,858)	$ (84,794)	$ (54,397)
Denominator:
Weighted average ordinary shares outstanding	3,394,467	2,539,191	2,997,415	2,536,992
Assumed exercise of pre-funded warrants	855,208	0	439,287	0
Weighted-average shares outstanding - basic	4,249,675	2,539,191	3,436,702	2,536,992
Weighted-average shares outstanding - diluted	4,249,675	3,002,154	3,436,702	2,536,992
Loss per share - basic	$ (10.81)	$ (10.67)	$ (24.67)	$ (21.44)
Loss per share - diluted	$ (10.81)	$ (11.28)	$ (24.67)	$ (21.44)