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Property and equipment (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Cost    
Property and equipment ¥ 2,561 ¥ 2,561
Accumulated depreciation    
Beginning balance 1,782 1,256
Addition   526
Depreciation 441  
Ending balance 2,223 1,782
Net book value    
Property and equipment, Net 338 779
Motor vehicles [Member]    
Cost    
Property and equipment 995 995
Accumulated depreciation    
Beginning balance 680 471
Addition   209
Depreciation 209  
Ending balance 889 680
Net book value    
Property and equipment, Net 106 315
Office equipment & furniture [Member]    
Cost    
Property and equipment 408 408
Accumulated depreciation    
Beginning balance 388 302
Addition   86
Depreciation  
Ending balance 388 388
Net book value    
Property and equipment, Net 20 20
Leasehold improvements [Member]    
Cost    
Property and equipment 1,158 1,158
Accumulated depreciation    
Beginning balance 714 483
Addition   231
Depreciation 232  
Ending balance 946 714
Net book value    
Property and equipment, Net ¥ 212 ¥ 444