v3.26.1
Share-based compensation - Assumptions (Details)
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Share-based compensation    
Expected volatility 95.20% 85.00%
Risk-free interest rate 4.00% 4.10%
Expected term (in years) 6 years 18 days 5 years 11 months 23 days