Summary of Significant Accounting Policies - Inventories (Details) - CNY (¥) ¥ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Summary of Significant Accounting Policies | |||
| Inventory write-downs | ¥ 151,327 | ¥ 129,964 | ¥ 131,769 |
| Inventory, firm purchase commitment, net loss | ¥ 91,680 | ¥ 205,976 | ¥ 104,971 |