v3.25.2
Income taxes (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Income taxes        
U.S. Statutory federal income tax rate 21.00% 21.00% 21.00% 21.00%
State income taxes, net of federal income tax 4.00% 4.00% 4.00% 4.00%
Change in valuation allowance 25.00% 25.00% (25.00%) (25.00%)
Effect income tax rate 0.00% 0.00% 0.00% 0.00%