Stock-based compensation - Schedule of option activity (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($)
Weighted Average Exercise Price
Options expired (in dollars per share) | $ / shares	$ 17.34
Performance stock units
Number of Options
Options exercised (in shares) | shares	(78,294)
2018 Plan
Number of Options
Options outstanding, beginning balance (in shares) | shares	1,486,428
Options exercised (in shares) | shares	(115,148)
Options exercised (in shares) | shares	(2,795)
Options outstanding, ending balance (in shares) | shares	1,368,485
Options vested and exercisable (in shares) | shares	1,368,485
Weighted Average Exercise Price
Options outstanding, beginning balance (in dollars per share) | $ / shares	$ 3.54
Options exercised (in dollars per share) | $ / shares	3.54
Options expired (in dollars per share) | $ / shares	3.54
Option outstanding, ending balance (in dollars per share) | $ / shares	3.54
Options vested and exercisable (in dollars per share) | $ / shares	$ 3.54
Aggregate Intrinsic Value and Weighted Average Contractual Term (in years)
Options outstanding, aggregate intrinsic value | $	$ 14,314	$ 14,552
Options vested and exercisable, aggregate intrinsic value | $	$ 14,314
Options outstanding, weighted average contractual term (in years)	4 years 3 months 18 days
Options vested and exercisable, weighted average contractual term (in years)	4 years 3 months 18 days
2020 Plan
Number of Options
Options outstanding, beginning balance (in shares) | shares	3,165,715
Options granted (in shares) | shares	25,000
Options exercised (in shares) | shares	(56,292)
Options forfeited (in shares) | shares	(130,467)
Options outstanding, ending balance (in shares) | shares	2,925,662
Options vested and exercisable (in shares) | shares	2,038,984
Weighted Average Exercise Price
Options outstanding, beginning balance (in dollars per share) | $ / shares	$ 12.79
Options granted (in dollars per share) | $ / shares	12.65
Options exercised (in dollars per share) | $ / shares	8.79
Options forfeited (in dollars per share) | $ / shares	13.91
Option outstanding, ending balance (in dollars per share) | $ / shares	12.70
Options vested and exercisable (in dollars per share) | $ / shares	$ 12.03
Aggregate Intrinsic Value and Weighted Average Contractual Term (in years)
Options outstanding, aggregate intrinsic value | $	$ 8,139	$ 7,197
Options vested and exercisable, aggregate intrinsic value | $	$ 6,909
Options outstanding, weighted average contractual term (in years)	6 years 8 months 12 days
Options vested and exercisable, weighted average contractual term (in years)	6 years 2 months 12 days