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Intangible assets, net (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Intangible assets, net |  |
Weighted average amortization period (in years) | 5 years | 5 years 8 months 12 days
Gross carrying amount | ¥ 51,355 | ¥ 45,395
Accumulated amortization | (31,259) | (21,344)
Net carrying amount | ¥ 20,096 | ¥ 24,051
Software |  |
Intangible assets, net |  |
Weighted average amortization period (in years) | 3 years 8 months 12 days | 4 years 10 months 24 days
Gross carrying amount | ¥ 42,715 | ¥ 37,055
Accumulated amortization | (27,482) | (18,378)
Net carrying amount | ¥ 15,233 | ¥ 18,677
Customer relationship |  |
Intangible assets, net |  |
Weighted average amortization period (in years) | 6 years | 10 years
Gross carrying amount | ¥ 7,735 | ¥ 7,736
Accumulated amortization | (3,364) | (2,600)
Net carrying amount | ¥ 4,371 | ¥ 5,136
Trademarks |  |
Intangible assets, net |  |
Weighted average amortization period (in years) | 10 years | 10 years
Gross carrying amount | ¥ 623 | ¥ 462
Accumulated amortization | (361) | (337)
Net carrying amount | ¥ 262 | ¥ 125
Patent right |  |
Intangible assets, net |  |
Weighted average amortization period (in years) | 10 years | 10 years
Gross carrying amount | ¥ 282 | ¥ 142
Accumulated amortization | (52) | (29)
Net carrying amount | ¥ 230 | ¥ 113

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