Stock-based compensation - Schedule of option activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Weighted Average Exercise Price
Options expired (in dollars per share)	$ 17.46
Performance stock units
Number of Options
Options exercised (in shares)	(27,541)
2018 Plan
Number of Options
Options outstanding, beginning balance (in shares)	1,486,428
Options exercised (in shares)	(65,533)
Options outstanding, ending balance (in shares)	1,420,895
Options vested and exercisable (in shares)	1,420,895
Weighted Average Exercise Price
Options outstanding, beginning balance (in dollars per share)	$ 3.54
Options exercised (in dollars per share)	3.54
Option outstanding, ending balance (in dollars per share)	3.54
Options vested and exercisable (in dollars per share)	$ 3.54
Aggregate Intrinsic Value and Weighted Average Contractual Term (in years)
Options outstanding, aggregate intrinsic value	$ 12,433	$ 14,552
Options vested and exercisable, aggregate intrinsic value	$ 12,433
Options outstanding, weighted average contractual term (in years)	4 years 9 months 18 days
Options vested and exercisable, weighted average contractual term (in years)	4 years 9 months 18 days
2020 Plan
Number of Options
Options outstanding, beginning balance (in shares)	3,165,715
Options granted (in shares)	19,000
Options exercised (in shares)	(3,587)
Options forfeited (in shares)	(43,175)
Options outstanding, ending balance (in shares)	3,110,412
Options vested and exercisable (in shares)	1,834,453
Weighted Average Exercise Price
Options outstanding, beginning balance (in dollars per share)	$ 12.79
Options granted (in dollars per share)	13.54
Options exercised (in dollars per share)	7.90
Options forfeited (in dollars per share)	14.75
Option outstanding, ending balance (in dollars per share)	12.73
Options vested and exercisable (in dollars per share)	$ 11.73
Aggregate Intrinsic Value and Weighted Average Contractual Term (in years)
Options outstanding, aggregate intrinsic value	$ 5,066	$ 7,197
Options vested and exercisable, aggregate intrinsic value	$ 4,470
Options outstanding, weighted average contractual term (in years)	7 years 3 months 18 days
Options vested and exercisable, weighted average contractual term (in years)	6 years 6 months