Stockholders' equity - Warrants Outstanding (Details)	Mar. 31, 2026 $ / shares shares
Stockholders' equity
Number of warrants	90,038,517
March 2024 Tranche A Warrants
Stockholders' equity
Number of warrants	1,097,394
Exercise price per share \| $ / shares	$ 7.29
March 2024 Tranche B Warrants
Stockholders' equity
Number of warrants	1,097,394
Exercise price per share \| $ / shares	$ 9.1125
March 2024 Pre-Funded Warrants
Stockholders' equity
Number of warrants	415,870
Exercise price per share \| $ / shares	$ 0.001
December 2025 Pre-Funded Warrants
Stockholders' equity
Number of warrants	21,459
Exercise price per share \| $ / shares	$ 0.001
December 2025 Warrants
Stockholders' equity
Number of warrants	2,880,533
Exercise price per share \| $ / shares	$ 1.04
January 2026 Pre-Funded Warrants
Stockholders' equity
Number of warrants	3,887,584
Exercise price per share \| $ / shares	$ 0.001
January 2026 Warrants
Stockholders' equity
Number of warrants	6,288,857
Exercise price per share \| $ / shares	$ 0.765
March 2026 Pre-Funded Warrants
Stockholders' equity
Number of warrants	37,174,713
Exercise price per share \| $ / shares	$ 0.001
March 2026 Warrants
Stockholders' equity
Number of warrants	37,174,713
Exercise price per share \| $ / shares	$ 0.683