Fair value of financial instruments - Items Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Financial assets
Warrant liability		$ 35,647
Level 3
Financial assets
Warrant liability		35,647
Recurring basis
Financial assets
Cash equivalents	$ 78,734	106,830
Total financial assets	78,734	106,830
Warrant liability		35,647
Notes	73,774	76,330
Total financial liabilities	73,774	111,977
Recurring basis \| Level 1
Financial assets
Cash equivalents	78,734	106,830
Total financial assets	78,734	106,830
Recurring basis \| Level 3
Financial assets
Warrant liability		35,647
Notes	73,774	76,330
Total financial liabilities	$ 73,774	$ 111,977

Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.