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Property and equipment, net - Depreciation expenses on property and equipment allocated to expense items (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Property and equipment, net |  |  |
Total depreciation | ¥ 45,087 | ¥ 43,137 | ¥ 38,480
Cost of revenues |  |  |
Property and equipment, net |  |  |
Total depreciation | 1,022 | 1,401 | 1,684
Selling and marketing expenses |  |  |
Property and equipment, net |  |  |
Total depreciation | 727 | 290 | 355
General and administrative expenses |  |  |
Property and equipment, net |  |  |
Total depreciation | 27,433 | 26,530 | 23,148
Research and development expenses |  |  |
Property and equipment, net |  |  |
Total depreciation | ¥ 15,905 | ¥ 14,916 | ¥ 13,293

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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- Definition 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. + References No definition available. + Details
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