Loss per share - Schedule of basic and diluted loss per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Numerator:
Net loss	$ (24,666)	$ (17,716)	$ (28,361)	$ (27,037)	$ (35,922)	$ (34,780)	$ (70,743)	$ (97,739)
Denominator:
Weighted-average number of shares used in computed net loss per share − basic	69,627,190			49,212,126			68,958,938	49,103,351
Weighted-average number of shares used in computed net loss per share − diluted	69,627,190			49,212,126			68,958,938	49,103,351
Net loss per share − basic (in dollars per share)	$ (0.35)			$ (0.55)			$ (1.03)	$ (1.99)
Net loss per share − diluted (in dollars per share)	$ (0.35)			$ (0.55)			$ (1.03)	$ (1.99)