Convertible debt - Schedule of Glencore Convertible Notes Valuation Assumptions (Details) - Glencore Convertible Notes	Dec. 31, 2024	Dec. 31, 2023
Risk free interest rate
Debt Conversion [Line Items]
Embedded derivative liability, measurement input	0.044	0.038
Expected life of options
Debt Conversion [Line Items]
Embedded derivative liability, measurement input	4.2	3.4
Expected dividend yield
Debt Conversion [Line Items]
Embedded derivative liability, measurement input	0.000	0.000
Expected stock price volatility
Debt Conversion [Line Items]
Embedded derivative liability, measurement input	0.82	0.65
Share Price
Debt Conversion [Line Items]
Embedded derivative liability, measurement input	1.79	4.68

Value of input used to measure embedded derivative liability.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant