Stock-based compensation - Stock Options - (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning balance (in shares) | shares	7,425,444
Granted (in shares) | shares	1,747,626
Exercised (in shares) | shares	(32,500)
Cancelled or forfeited (in shares) | shares	(230,974)
Outstanding, ending balance (in shares) | shares	8,909,596
Exercisable (in shares) | shares	3,880,357
Weighted Average Exercise Price
Outstanding (in dollars per share) | $ / shares	$ 8.52
Granted (in dollars per share) | $ / shares	7.68
Exercised (in dollars per share) | $ / shares	4.91
Cancelled or forfeited (in dollars per share) | $ / shares	12.28
Outstanding (in dollars per share) | $ / shares	8.27
Exercisable (in dollars per share) | $ / shares	$ 9.04
Remaining Contractual Life
Outstanding	7 years 9 months 18 days
Exercisable	6 years 2 months 12 days
Aggregate Intrinsic Value
Outstanding | $	$ 17,875
Exercisable | $	8,728
Employee Stock Option [Member]
Options disclosures
Unrecognized stock-based compensation expense | $	$ 23,200
Remaining weighted-average remaining vesting period	3 years