Accounts and other receivables - Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 2	$ 14
Other receivables	13,042	10,816
Provision for expected credit loss	(5,304)	(10,304)
Accounts and other receivables	$ 7,740	526
VRB \| Disposal Group, Disposed of by Sale, Not Discontinued Operations \| VRB China
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables		$ 10,300
Red Sun \| Disposal Group, Disposed of by Sale, Not Discontinued Operations \| VRB China
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of ownership interest of counterparty (in percent)		51.00%

Disposal Group, Including Discontinued Operation, Ownership Interest Of Counterparty After Disposal

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer.

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