Stock-based compensation - Narrative (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted (in shares)	4,427,620
Stock options granted, weighted average exercise price (in dollars per share) | $ / shares	$ 3.89
Stock options granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 2.86
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation costs | $	$ 42.9
Expected to be recognized over a weighted average period	2 years 4 months 24 days
Performance-based RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation costs | $	$ 6.4
Units vested (in shares)	135,301
Share-based compensation, number of common stock issuable per RSU vested (in shares)	1
Number of shares retained to cover statutory minimum withholding taxes	17,556
Time-based RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation costs | $	$ 3.4
Expected to be recognized over a weighted average period	3 years 4 months 24 days
Units vested (in shares)	0