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Accounts receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Trade accounts receivable | $ 157 | $ 14
Other receivables | 11,047 | 10,816
Provision for expected credit loss | (5,304) | (10,304)
Accounts and other receivables | $ 5,900 | 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%

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