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v3.26.1

Stockholders' equity - Schedule of Outstanding Warrants (Details) - $ / shares | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Class of Stock [Line Items] |  |
Warrant outstanding (in shares) | 40,969,657 | 58,420,290
Private Placement Offering Warrants |  |
Class of Stock [Line Items] |  |
Exercise price (in dollars per share) | $ 1.0680 | $ 1.068
Exercise period | 5 years | 5 years
Warrant outstanding (in shares) | 36,808,240 | 46,816,480
Number of securities called by each warrant (in shares) | 0.1 | 0.1
2025 3-Year Warrants |  |
Class of Stock [Line Items] |  |
Exercise price (in dollars per share) | $ 4.200 | $ 4.200
Exercise period | 3 years | 3 years
Warrant outstanding (in shares) | 4,161,417 | 4,823,900
2025 2-Year Warrants |  |
Class of Stock [Line Items] |  |
Exercise price (in dollars per share) | $ 6.000 | $ 6.000
Exercise period | 2 years | 2 years
Warrant outstanding (in shares) | 0 | 6,779,910

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