Common stock - Stock for issuance (Details) - shares	Sep. 30, 2026	Dec. 31, 2025
Common stock
Shares underlying issued and outstanding awards under the Plans	20,435,156	15,856,758
Shares underlying issued and outstanding awards under the Plans	19,360,956	15,856,758
Total reserved common stock	26,373,019	19,861,949
2020 Equity Incentive Plan
Common stock
Remaining shares available for issuance under the Plans and ESPP	3,387,004	2,454,332
ESPP
Common stock
Remaining shares available for issuance under the Plans and ESPP	2,550,859	1,550,859