Net loss per share - Schedule of basic and diluted loss per share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Numerator:
Net loss	$ (132,493)	$ (128,175)
Denominator:
Weighted-average number of shares - basic (in shares)	49,640,505	48,861,665
Weighted-average number of shares - diluted (in shares)	49,640,505	48,861,665
Net loss per share — diluted (in dollars per share)	$ (2.67)	$ (2.62)
Net loss per share — basic (in dollars per share)	$ (2.67)	$ (2.62)