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Taxation - Reconciliation of the differences between statutory tax rate and the effective tax rate (Details) ¥ / shares in Units, ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2025 CNY (¥) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 CNY (¥) ¥ / shares | Dec. 31, 2023 CNY (¥) ¥ / shares
Reconciliation of the differences between statutory tax rate and the effective tax rate, Amount |  |  |  |
PRC Statutory income tax rate | ¥ (24,273) |  |  |
Changes in valuation allowances | 72,032 |  |  |
Nontaxable or Nondeductible items |  |  |  |
Effect of preferential tax benefits | 12,582 |  |  |
Effect of Super Deduction available | (54,855) |  |  |
Permanent differences | 35,650 |  |  |
Total income tax expenses | ¥ 12,806 | $ 1,831 | ¥ 13,500 | ¥ 13,215
Tax Jurisdiction of Domicile [Extensible Enumeration] | China | China | China |
Reconciliation of the differences between statutory tax rate and the effective tax rate, Percent |  |  |  |
PRC Statutory income tax rate | 25.00% | 25.00% | 25.00% | 25.00%
Effect of tax holiday and preferential tax benefits |  |  | (42.90%) | (19.10%)
Statutory tax rate difference |  |  | 64.80% | 22.80%
Permanent differences | (36.70%) | (36.70%) | 10.50% | (10.30%)
Changes in valuation allowances | (74.10%) | (74.10%) | (241.80%) | (58.70%)
Nontaxable or Nondeductible items |  |  |  |
Preferential tax rate | (13.00%) | (13.00%) |  |
Effect of Super Deduction available | 56.50% | 56.50% | 145.20% | 33.40%
Income tax expense | (13.20%) | (13.20%) | (39.20%) | (6.90%)
Effect of tax holidays inside the PRC on basic earnings per share/ADS (RMB) | ¥ / shares |  |  | ¥ 0.19 | ¥ 0.28
Singapore |  |  |  |
Reconciliation of the differences between statutory tax rate and the effective tax rate, Amount |  |  |  |
Statutory tax rate difference | ¥ (2,847) |  |  |
Others | ¥ 54 |  |  |
Reconciliation of the differences between statutory tax rate and the effective tax rate, Percent |  |  |  |
PRC Statutory income tax rate | 17.00% | 17.00% |  |
Statutory tax rate difference | 2.90% | 2.90% |  | 17.00%
Others | (0.10%) | (0.10%) |  |
Hong Kong |  |  |  |
Reconciliation of the differences between statutory tax rate and the effective tax rate, Amount |  |  |  |
Statutory tax rate difference | ¥ (7,282) |  |  |
Non-taxable income | (13,493) |  |  |
Others | ¥ (1) |  |  |
Reconciliation of the differences between statutory tax rate and the effective tax rate, Percent |  |  |  |
PRC Statutory income tax rate | 16.50% | 16.50% |  |
Statutory tax rate difference | 7.50% | 7.50% |  |
Non-taxable income | 13.90% | 13.90% |  |
Others | 0.00% | 0.00% |  |
Cayman Islands |  |  |  |
Reconciliation of the differences between statutory tax rate and the effective tax rate, Amount |  |  |  |
Statutory tax rate difference | ¥ (10,437) |  |  |
Reconciliation of the differences between statutory tax rate and the effective tax rate, Percent |  |  |  |
Statutory tax rate difference | 10.80% | 10.80% | 0.00% | 0.00%
United States |  |  |  |
Reconciliation of the differences between statutory tax rate and the effective tax rate, Amount |  |  |  |
Withholding tax | ¥ 4,059 |  |  |
Reconciliation of the differences between statutory tax rate and the effective tax rate, Percent |  |  |  |
Withholding tax | (4.20%) | (4.20%) |  |
China |  |  |  |
Reconciliation of the differences between statutory tax rate and the effective tax rate, Amount |  |  |  |
Withholding tax | ¥ 1,612 |  |  |
Others | ¥ 5 |  |  |
Reconciliation of the differences between statutory tax rate and the effective tax rate, Percent |  |  |  |
PRC Statutory income tax rate | 25.00% | 25.00% |  |
Withholding tax | (1.70%) | (1.70%) |  |
Others | 0.00% | 0.00% |  |

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