Stock-based compensation - Stock Options - (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning balance (in shares)	7,425,444
Granted (in shares)	2,407,326
Exercised (in shares)	(106,831)
Cancelled or forfeited (in shares)	(925,475)
Outstanding, ending balance (in shares)	8,800,464	7,425,444
Exercisable (in shares)	4,837,929
Weighted Average Exercise Price
Outstanding (in dollars per share)	$ 8.52
Granted (in dollars per share)	7.75
Exercised (in dollars per share)	4.49
Cancelled or forfeited (in dollars per share)	10.98
Outstanding (in dollars per share)	8.1	$ 8.52
Exercisable (in dollars per share)	$ 8.45
Remaining Contractual Life
Outstanding	7 years 3 months 18 days
Exercisable	6 years 4 months 24 days
Aggregate Intrinsic Value
Outstanding	$ 3,462
Exercisable	$ 2,732
Employee Stock Option
Options disclosures
Weighted average fair value of grants (in dollars per share)	$ 5.45	$ 6.12	$ 3.6