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Stockholders' equity - Schedule of Common Stock Reserved for Future Issuance (Details) - shares	Sep. 30, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares of common stock reserved (in shares)	32,636,254	27,803,828
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	2,208,391	4,621,021
Restricted Stock Units RSU and Performance Shares Units PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs outstanding and PSUs (in shares)	17,394,641	16,738,309
2021 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options available for future issuance (in shares)	9,658,846	4,093,695
2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options available for future issuance (in shares)	3,374,376	2,350,803

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