Net loss per share - Schedule of basic and diluted loss per share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Numerator:
Net loss	$ (104,994)	$ (105,316)
Denominator:
Weighted-average common stock outstanding (in shares)	76,915,757	69,372,993
Weighted-average number of shares - diluted (in shares)	82,894,459	69,372,993
Weighted-average number of shares - basic (in shares)	82,894,459	69,372,993
Net loss per share — diluted (in dollars per share)	$ (1.27)	$ (1.52)
Net loss per share — basic (in dollars per share)	$ (1.27)	$ (1.52)
Pre-Funded Warrants
Denominator:
Weighted average of pre-funded warrants exercisable for nominal consideration(in shares)	5,978,702	0