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SIGNIFICANT ACCOUNTING POLICIES - Concentration and risks (Details) - Institution	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Concentration Risk
Number of financial institutions	5
Number of customers	no	no	no
Number of suppliers	no	no	no
Cash and cash equivalents, restricted cash, short-term investments and long-term debt investments denominated in RMB | Geographic Concentration Risk | CN | Financial Institution One
Concentration Risk
Concentration risk, percentage	16.40%
Cash and cash equivalents, restricted cash, short-term investments and long-term debt investments denominated in RMB | Geographic Concentration Risk | CN | Financial Institution Two
Concentration Risk
Concentration risk, percentage	13.30%
Cash and cash equivalents, restricted cash, short-term investments and long-term debt investments denominated in RMB | Geographic Concentration Risk | CN | Financial Institution Three
Concentration Risk
Concentration risk, percentage	9.80%
Cash and cash equivalents, restricted cash, short-term investments and long-term debt investments denominated in RMB | Geographic Concentration Risk | CN | Financial Institution Four
Concentration Risk
Concentration risk, percentage	9.50%
Cash and cash equivalents, restricted cash, short-term investments and long-term debt investments denominated in RMB | Geographic Concentration Risk | CN | Financial Institution Five
Concentration Risk
Concentration risk, percentage	7.20%

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- Definition

Represents number of financial institution in which cash, cash equivalents and short term investments are held.

+ References

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Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Description of risks that arise due to the volume of business transacted with a particular supplier or reliance placed on that supplier. At a minimum, the description informs financial statement users of the general nature of the risk.

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