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Restricted cash - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	$ 22,656		$ 22,493
Guarantor obligations	58,900		58,900
Interest income	1,896	$ 713
Surety bond cash collateral
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	22,600		$ 22,400
Restricted Cash
Restricted Cash and Cash Equivalent Item [Line Items]
Interest income	200	$ 200
Surety bond, Hycroft Mine financial requirements
Restricted Cash and Cash Equivalent Item [Line Items]
Guarantor obligations	58,300
Surety Bond, Hycroft Mine financial requirements, water well field and exploration
Restricted Cash and Cash Equivalent Item [Line Items]
Guarantor obligations	$ 600