Loss per share - Schedule of basic and diluted loss per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Numerator:
Net loss	$ (25,129)	$ (26,322)
Denominator:
Weighted-average number of shares used in computed net loss per share − basic	126,074,555	70,833,044
Weighted-average number of shares used in computed net loss per share − diluted	126,074,555	70,833,044
Net loss per share − basic (in dollars per share)	$ (0.20)	$ (0.37)
Net loss per share − diluted (in dollars per share)	$ (0.20)	$ (0.37)