Organization and principal activities (Details 1) - CNY (¥) ¥ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement [Line Items]
Total current assets	¥ 615,611	¥ 590,937
Total non-current assets	48,137	50,833
Total assets	663,748	641,770
Total current liabilities	237,586	274,704
VIEs [Member]
Statement [Line Items]
Total current assets	615,611	599,931
Total non-current assets	48,137	50,833
Total assets	663,748	650,764
Total current liabilities	237,587	274,316
Total liabilities	¥ 237,587	¥ 274,316

Expiry date 2020-01-01: The amount of resources: (a) controlled by the entity as a result of past events; and (b) from which future economic benefits are expected to flow to the entity. Effective 2020-01-01: The amount of a present economic resource controlled by the entity as a result of past events. Economic resource is a right that has the potential to produce economic benefits.

Expiry date 2020-01-01: The amount of present obligations of the entity arising from past events, the settlement of which is expected to result in an outflow from the entity of resources embodying economic benefits. Effective 2020-01-01: The amount of a present obligation of the entity to transfer an economic resource as a result of past events. Economic resource is a right that has the potential to produce economic benefits.

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