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Restricted cash - Schedule of Components of Restricted Cash (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Restricted Cash and Cash Equivalent Item [Line Items] |  |
Total | $ 14,483 | $ 22,493
Surety bond cash collateral |  |
Restricted Cash and Cash Equivalent Item [Line Items] |  |
Total | 14,429 | 22,439
Other cash collateral |  |
Restricted Cash and Cash Equivalent Item [Line Items] |  |
Total | $ 54 | $ 54

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