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Restricted cash - Schedule of Components of Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Restricted Cash and Cash Equivalent Item [Line Items]    
Total $ 14,598 $ 22,493
Surety bond cash collateral    
Restricted Cash and Cash Equivalent Item [Line Items]    
Total 14,544 22,439
Other cash collateral    
Restricted Cash and Cash Equivalent Item [Line Items]    
Total $ 54 $ 54