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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
	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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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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