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Property and equipment, net - Depreciation expenses on property and equipment allocated to expense items (Details) - CNY (¥)	12 Months Ended
	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

X

- 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

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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)
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-Topic 230
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-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

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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.

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