Stock-based compensation - Schedule of option activity (Details) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares
Weighted Average Exercise Price
Options expired (in dollars per share) | $ / shares	$ 20.71
Performance stock units
Number of Options
Options exercised (in shares) | shares	(14,639)
2018 Plan
Number of Options
Options outstanding, beginning balance (in shares) | shares	1,598,811
Options exercised (in shares) | shares	(32,795)
Options outstanding, ending balance (in shares) | shares	1,566,016	1,598,811
Options vested and exercisable (in shares) | shares	1,519,130
Weighted Average Exercise Price
Options outstanding, beginning balance (in dollars per share) | $ / shares	$ 3.54
Options exercised (in dollars per share) | $ / shares	3.54
Option outstanding, ending balance (in dollars per share) | $ / shares	3.54	$ 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 | $	$ 8,942	$ 12,279
Options vested and exercisable, aggregate intrinsic value | $	$ 8,674
Options outstanding, weighted average contractual term (in years)	5 years 7 months 6 days	6 years
Options vested and exercisable, weighted average contractual term (in years)	5 years 6 months
2020 Plan
Number of Options
Options outstanding, beginning balance (in shares) | shares	3,003,611
Options granted (in shares) | shares	597,000
Options exercised (in shares) | shares	(2,123)
Options forfeited (in shares) | shares	(164,708)
Options outstanding, ending balance (in shares) | shares	3,419,141	3,003,611
Options vested and exercisable (in shares) | shares	1,415,499
Weighted Average Exercise Price
Options outstanding, beginning balance (in dollars per share) | $ / shares	$ 13.22
Options granted (in dollars per share) | $ / shares	11.68
Options exercised (in dollars per share) | $ / shares	8.20
Options forfeited (in dollars per share) | $ / shares	15.51
Option outstanding, ending balance (in dollars per share) | $ / shares	12.82	$ 13.22
Options vested and exercisable (in dollars per share) | $ / shares	$ 10.90
Aggregate Intrinsic Value and Weighted Average Contractual Term (in years)
Options outstanding, aggregate intrinsic value | $	$ 1,337	$ 3,883
Options vested and exercisable, aggregate intrinsic value | $	$ 1,069
Options outstanding, weighted average contractual term (in years)	7 years 9 months 18 days	8 years 3 months 18 days
Options vested and exercisable, weighted average contractual term (in years)	6 years 7 months 6 days