Net loss per share - Schedule of diluted net loss per share attributable to common stockholders (Details) - shares	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total anti-dilutive common stock equivalents (in shares)	117,888,655	16,760,573
Class A Warrants
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total anti-dilutive common stock equivalents (in shares)	50,608,500	0
Class B Warrants
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total anti-dilutive common stock equivalents (in shares)	50,608,500	0
Options to purchase common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total anti-dilutive common stock equivalents (in shares)	11,537,050	13,889,147
Restricted stock units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total anti-dilutive common stock equivalents (in shares)	5,134,605	2,871,426