Net loss per share - Schedule of antidilutive securities excluded from computation of earnings per share (Details) - shares	1 Months Ended	12 Months Ended
	Oct. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities		117,739,718	13,292,930
Class A Warrants | Underwritten Offering
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Warrants issued (in shares)	50,608,500	50,608,500	0
Class B Warrants | Underwritten Offering
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Warrants issued (in shares)	50,608,500	50,608,500	0
Options to purchase common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities		13,703,967	11,849,611
Restricted stock units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities		2,818,751	1,443,319