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Summary of significant accounting policies - Risks and concentration (Details) - Customer concentration risk | 6 Months Ended | 12 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Accounts receivable - third parties, net | Geely Group and its subsidiaries |  |  |
Risks and Concentration |  |  |
Concentration risk percentage | 77.50% |  | 86.40%
Accounts receivable - third parties, net | Customer A, a third party |  |  |
Risks and Concentration |  |  |
Concentration risk percentage | 46.50% |  | 42.00%
Accounts receivable - third parties, net | Customer A, a third party |  |  |
Risks and Concentration |  |  |
Concentration risk percentage | 31.30% |  |
Accounts receivable - third parties, net | Customer B, a third party |  |  |
Risks and Concentration |  |  |
Concentration risk percentage |  |  | 28.60%
Accounts receivable - third parties, net | Customer C, a third party |  |  |
Risks and Concentration |  |  |
Concentration risk percentage |  |  | 15.10%
Total revenues | Geely Group and its subsidiaries |  |  |
Risks and Concentration |  |  |
Concentration risk percentage | 79.40% | 72.90% |
Accounts payable | Supplier A, a third party |  |  |
Risks and Concentration |  |  |
Concentration risk percentage | 18.30% |  | 15.70%
Accounts payable | Supplier B, a third party |  |  |
Risks and Concentration |  |  |
Concentration risk percentage | 16.50% |  | 12.50%
Accounts payable | Supplier C, a third party |  |  |
Risks and Concentration |  |  |
Concentration risk percentage | 12.30% |  | 22.80%
Liabilities, Total | Supplier A, a third party |  |  |
Risks and Concentration |  |  |
Concentration risk percentage | 25.70% | 23.10% |
Liabilities, Total | Supplier B, a third party |  |  |
Risks and Concentration |  |  |
Concentration risk percentage |  | 13.20% |
Liabilities, Total | Supplier C, a third party |  |  |
Risks and Concentration |  |  |
Concentration risk percentage | 21.20% |  |

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