Stock-based compensation - Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Number of options outstanding
Balance (in shares)	15,387,546
Granted (in shares)	0
Exercised (in shares)	(672,583)
Forfeited (in shares)	(45,731)
Expired (in shares)	(26,821)
Balance (in shares)	14,642,411	15,387,546
Options exercisable (in shares)	11,919,869
Options unvested (in shares)	3,544,841
Weighted  average  exercise  price  ($)
Balance (in usd per share)	$ 1.76
Granted (in usd per share)	0
Exercised (in usd per share)	0.81
Forfeited (in usd per share)	1.14
Expired (in usd per share)	0.81
Balance (in usd per share)	1.72	$ 1.76
Options exercisable (in usd per share)	1.02
Options unvested (in usd per share)	$ 3.84
Weighted average remaining contractual term (years)
Balance	7 years 5 months 12 days	7 years 1 month 13 days
Options exercisable	6 years 8 months 1 day
Options unvested	8 years 9 months
Aggregate intrinsic value ($)
Balance		$ 8,763
Exercised	$ 40