Finance costs (Details) - SEK (kr) kr in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| IfrsStatementLineItems [Line Items] | ||
| Total finance costs | kr (677,198) | kr (224,345) |
| Interest Expense On Loans And Borrowings [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Total finance costs | (14,289) | (119,229) |
| Interest Expense On Lease Liabilitie [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Total finance costs | (49,068) | (43,730) |
| Interest Expense On Convertible Debenture [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Total finance costs | (445,181) | (40,648) |
| Interest Expense On Liabilities Associated With Cash Advances [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Total finance costs | (80,108) | (11,172) |
| Exchange Rate Losses [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Total finance costs | (85,851) | (7,352) |
| Other Finance Costs [Member] | ||
| IfrsStatementLineItems [Line Items] | ||
| Total finance costs | kr (2,701) | kr (2,214) |