Stockholder's equity - Warrants Additional Information (Details) - $ / shares	Dec. 31, 2025	Dec. 14, 2025	Oct. 05, 2025	Sep. 02, 2025	Jul. 11, 2025	Jun. 30, 2025	May 28, 2025	Dec. 31, 2024	Dec. 31, 2020	Oct. 06, 2020	May 29, 2020
Class of Stock [Line Items]
Exercise Period	36 months
Warrant outstanding (in shares)	58,420,290							90,019,112
Private Placement Offering Warrants
Class of Stock [Line Items]
Exercise price (in USD per share)	$ 1.068	$ 6.00						$ 1.068
Exercise Period	5 years							5 years
Warrant outstanding (in shares)	46,816,480							46,816,480
2025 3-Year Warrants
Class of Stock [Line Items]
Exercise price (in USD per share)	$ 4.200	$ 4.20
Exercise Period	3 years				3 years
Warrant outstanding (in shares)	4,823,900					7,187,500
2025 2-Year Warrants
Class of Stock [Line Items]
Exercise price (in USD per share)	$ 6.000			$ 6.00
Exercise Period	2 years
Warrant outstanding (in shares)	6,779,910			7,008,528
5-Year Public Warrants
Class of Stock [Line Items]
Exercise price (in USD per share)								$ 11.500	$ 11.50		$ 11.50
Exercise Period								5 years			5 years
Warrant outstanding (in shares)	0						33,619,298	33,619,298
Public Offering Warrants (5-Year)
Class of Stock [Line Items]
Exercise price (in USD per share)								$ 10.500	$ 10.50	$ 10.50
Exercise Period								5 years		5 years
Warrant outstanding (in shares)	0		9,583,334					9,583,334
Liability Warrant, Five-Year Public Warrants
Class of Stock [Line Items]
Warrant outstanding (in shares)								670,600