Stockholders' equity - Summary of Outstanding Warrants Rollforward (Details) - shares		1 Months Ended	12 Months Ended
	May 29, 2025	Dec. 31, 2025	Dec. 31, 2025
Class of Warrant or Right [Roll Forward]
Beginning balance (in shares)			90,019,112
Warrants Issued (in shares)			14,196,028
Warrants Expired (in shares)			(43,202,632)
Warrants Exercised (in shares)			(2,592,218)
Ending balance (in shares)		58,420,290	58,420,290
5-Year Public Warrants
Class of Warrant or Right [Roll Forward]
Beginning balance (in shares)	33,619,298		33,619,298
Warrants Issued (in shares)			0
Warrants Expired (in shares)	(33,619,298)		(33,619,298)
Warrants Exercised (in shares)			0
Ending balance (in shares)		0	0
Public Offering Warrants (5-Year)
Class of Warrant or Right [Roll Forward]
Beginning balance (in shares)			9,583,334
Warrants Issued (in shares)			0
Warrants Expired (in shares)			(9,583,334)
Warrants Exercised (in shares)			0
Ending balance (in shares)		0	0
Private Placement Offering Warrants
Class of Warrant or Right [Roll Forward]
Beginning balance (in shares)			46,816,480
Warrants Issued (in shares)			0
Warrants Expired (in shares)			0
Warrants Exercised (in shares)		(111,809)	0
Ending balance (in shares)		46,816,480	46,816,480
2025 3-Year Warrants
Class of Warrant or Right [Roll Forward]
Beginning balance (in shares)
Warrants Issued (in shares)			7,187,500
Warrants Expired (in shares)			0
Warrants Exercised (in shares)			(2,363,600)
Ending balance (in shares)		4,823,900	4,823,900
2025 2-Year Warrants
Class of Warrant or Right [Roll Forward]
Beginning balance (in shares)
Warrants Issued (in shares)			7,008,528
Warrants Expired (in shares)			0
Warrants Exercised (in shares)			(228,618)
Ending balance (in shares)		6,779,910	6,779,910
Liability Warrant, Five-Year Public Warrants
Class of Warrant or Right [Roll Forward]
Beginning balance (in shares)			670,600