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Earnings per share (Details) - CNY (¥)
¥ / shares in Units, ¥ in Thousands, shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share Details Narrative Abstract      
Net profit attributable to the equity holders of the Company – numerator for basic and diluted earnings per share ¥ 6,524 ¥ 23,061 ¥ 33,558
Weighted average share outstanding – denominator for basic and diluted earnings per share 1,000,172 236,180 227,717
Basic and diluted earnings per share ¥ 0.01 ¥ 0.10 ¥ 0.15