Net loss per share - Basic and diluted net loss per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Numerator:
Net loss	$ (26,563)	$ (39,064)
Denominator:
Weighted average ordinary shares outstanding, basic	42,560,091	30,001,725
Weighted average ordinary shares outstanding, diluted	42,560,091	30,001,725
Net loss per share, basic	$ (0.62)	$ (1.30)
Net loss per share, diluted	$ (0.62)	$ (1.30)