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Property and equipment, net - Depreciation expenses on property and equipment allocated to expense items (Details) - CNY (¥) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Property and equipment, net |  |  |
Total depreciation | ¥ 53,959,000 | ¥ 50,527,000 | ¥ 43,273,000
Impairment loss | 7,292,000 | 0 | 0
Cost of revenues |  |  |
Property and equipment, net |  |  |
Total depreciation | 544,000 | 1,022,000 | 1,401,000
Selling, general and administrative expenses |  |  |
Property and equipment, net |  |  |
Total depreciation | 29,914,000 | 31,931,000 | 26,834,000
Impairment loss | 454,000 |  |
Research and development expenses |  |  |
Property and equipment, net |  |  |
Total depreciation | 23,501,000 | ¥ 17,574,000 | ¥ 15,038,000
Impairment loss | ¥ 6,838,000 |  |

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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 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482130/360-10-45-15 + 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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- Details
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