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Profit before income taxes (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Depreciation of property and equipment ¥ 2,977 ¥ 2,944 ¥ 818
Amortization of intangible assets 1 2 0
Directors      
salaries and related costs 1,051 1,704 1,815
social benefits contribution 5 44 130
share based compensation 37 50 589
Key management personnel (other than directors)      
salaries and related costs 1,563 2,079 3,501
social benefits contribution 5 51 150
share based compensation 74 25 100
Other than directors and key management personnel      
salaries and related costs 707 2,653 1,863
social benefits contribution ¥ 10 ¥ 456 ¥ 452