Net loss per share - Basic and diluted net loss per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator:
Net loss	$ (39,064)	$ (27,564)
Denominator:
Weighted average ordinary shares outstanding, basic	30,001,725	29,605,143
Weighted average ordinary shares outstanding, diluted	30,001,725	29,605,143
Net loss per share, basic	$ (1.30)	$ (0.93)
Net loss per share, diluted	$ (1.30)	$ (0.93)