Summary of significant accounting policies - Summary of intangible assets with a definite useful life (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Trademarks and patents | Minimum | |
| Intangible assets with a definite useful life | |
| Useful life, intangible assets other than goodwill | 3 years |
| Trademarks and patents | Maximum | |
| Intangible assets with a definite useful life | |
| Useful life, intangible assets other than goodwill | 10 years |
| Software | Minimum | |
| Intangible assets with a definite useful life | |
| Useful life, intangible assets other than goodwill | 2 years |
| Software | Maximum | |
| Intangible assets with a definite useful life | |
| Useful life, intangible assets other than goodwill | 10 years |
| Other | Minimum | |
| Intangible assets with a definite useful life | |
| Useful life, intangible assets other than goodwill | 1 year |
| Other | Maximum | |
| Intangible assets with a definite useful life | |
| Useful life, intangible assets other than goodwill | 5 years |