Common stock - Stock for issuance (Details) - shares	Mar. 31, 2026	Dec. 31, 2025
Common stock
Stock options issued and outstanding under the Plans	16,218,110	15,856,758
Total reserved common stock	25,349,079	19,861,949
2020 Equity Incentive Plan
Common stock
Remaining shares available for issuance under the Plans and ESPP	6,580,110	2,454,332
ESPP
Common stock
Remaining shares available for issuance under the Plans and ESPP	2,550,859	1,550,859