Net loss per share - Computation of Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Numerator:
Net loss	$ (53,772)	$ (49,555)
Denominator:
Weighted average common shares outstanding, basic (in shares)	69,185,885	66,367,702
Weighted average common shares outstanding, diluted (in shares)	69,185,885	66,367,702
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.78)	$ (0.75)
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.78)	$ (0.75)