Principal accounting policies - Schedule of Property and Equipment Estimated Useful Lives and Residual Rate (Details)	Dec. 31, 2024
Servers, computers and equipment
Property, Plant and Equipment
Residual rate	0.00%
Servers, computers and equipment \| Minimum
Property, Plant and Equipment
Estimated useful lives	3 years
Servers, computers and equipment \| Maximum
Property, Plant and Equipment
Estimated useful lives	4 years
Leasehold improvements
Property, Plant and Equipment
Residual rate	0.00%
Estimated useful lives	us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember
Office furniture and others \| Minimum
Property, Plant and Equipment
Estimated useful lives	3 years
Residual rate	0.00%
Office furniture and others \| Maximum
Property, Plant and Equipment
Estimated useful lives	5 years
Residual rate	5.00%

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

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- Definition

Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost.

+ References

No definition available.

+ Details

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Definition

Indicates description of term of useful life for property, plant, and equipment when not stated as numeric value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482190/360-10-35-3

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