Net loss per share - Computation of Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator:
Net loss	$ (174,284)	$ (118,036)
Denominator:
Weighted average common shares outstanding, basic (in shares)	58,213,010	52,212,269
Weighted average common shares outstanding, diluted (in shares)	58,213,010	52,212,269
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (2.99)	$ (2.26)
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (2.99)	$ (2.26)