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Financial instruments and risk management - Credit risk (Details) - Major customers	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Customer A | Revenues
Concentration Risk [Line Items]
Concentration risk, percentage	27.00%	8.00%
Customer B | Revenues
Concentration Risk [Line Items]
Concentration risk, percentage	25.00%	23.00%
Customer C | Revenues
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%	27.00%
Customer D | Revenues
Concentration Risk [Line Items]
Concentration risk, percentage	2.00%	20.00%
Customer 1 | Accounts receivable and contract assets
Concentration Risk [Line Items]
Concentration risk, percentage	23.00%	2.00%
Customer 2 | Accounts receivable and contract assets
Concentration Risk [Line Items]
Concentration risk, percentage	20.00%	22.00%
Customer 3 | Accounts receivable and contract assets
Concentration Risk [Line Items]
Concentration risk, percentage	6.00%	16.00%
Customer 4 | Accounts receivable and contract assets
Concentration Risk [Line Items]
Concentration risk, percentage	6.00%	13.00%

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