Restricted cash - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	$ 22,493	$ 27,498
Guarantor obligations	58,900	58,700
Interest income	4,385	4,419
Restricted Cash
Restricted Cash and Cash Equivalent Item [Line Items]
Interest income	1,000	$ 1,100
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