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Loss before income taxes (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Depreciation Of Property And Equipment ¥ 2,903 ¥ 2,952 ¥ 2,973
Amortization Of Intangible Asset 1 0 1
Directors      
Salaries And Related Costs 552 816 602
Social Benefits Contribution 0 24 11
Key Management Personnel (other Than Directors)      
Salaries And Related Costs 1,317 1,212 1,380
Social Benefits Contribution 10 0 11
Other Than Directors And Key Management Personnel      
Salaries And Related Costs 605 689 578
Social Benefits Contribution ¥ 14 ¥ 36 ¥ 44