Stock-based compensation - Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Number of options outstanding
Balance (in shares)	15,387,546
Granted (in shares)	0
Exercised (in shares)	(1,486,404)
Forfeited (in shares)	(924,993)
Expired (in shares)	(261,476)
Balance (in shares)	12,714,673	15,387,546
Options exercisable (in shares)	10,478,450
Options unvested (in shares)	2,229,789
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)	4.15
Expired (in usd per share)	1.84
Balance (in usd per share)	1.70	$ 1.76
Options exercisable (in usd per share)	1.19
Options unvested (in usd per share)	$ 4.09
Weighted average remaining contractual term (years)
Balance	6 years 9 months 10 days	7 years 1 month 13 days
Options exercisable	6 years 5 months 12 days
Options unvested	8 years 4 months 6 days
Aggregate intrinsic value ($)
Balance	$ 14,344	$ 8,763
Exercised	70
Options exercisable	12,545
Options unvested	$ 1,791