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Property and equipment (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement [Line Items]    
Beginning balance ¥ 53,720 ¥ 53,865
Additions 0 271
Disposals   (416)
Ending balance 53,720 53,720
Accumulated depreciation    
Beginning balance 5,590 3,041
Depreciation 2,977 2,975
Adjustment   (31)
Disposals   (395)
Ending balance 8,567 5,590
Net book value of assets 45,153 48,130
Motor vehicles [member]    
Statement [Line Items]    
Beginning balance 579 995
Additions 0 0
Disposals   (416)
Ending balance 579 579
Accumulated depreciation    
Depreciation 0 0
Adjustment   (31)
Net book value of assets 29 29
Accumulated depreciation    
Balance at the beginning 550 976
Disposal   (395)
Balance at the end 550 550
Office equipment & furniture [Member]    
Statement [Line Items]    
Beginning balance 1,078 1,039
Additions 0 39
Disposals   0
Ending balance 1,078 1,078
Accumulated depreciation    
Depreciation 138 136
Adjustment   0
Net book value of assets 413 551
Accumulated depreciation    
Balance at the beginning 527 391
Disposal   0
Balance at the end 665 527
Leasehold improvements [Member]    
Statement [Line Items]    
Beginning balance 3,923 3,923
Additions 0 0
Disposals   0
Ending balance 3,923 3,923
Accumulated depreciation    
Depreciation 553 553
Adjustment   0
Net book value of assets 1,613 2,166
Accumulated depreciation    
Balance at the beginning 1,757 1,204
Disposal   0
Balance at the end 2,310 1,757
Property [Member]    
Statement [Line Items]    
Beginning balance 48,140 47,908
Additions 0 232
Disposals   0
Ending balance 48,140 48,140
Accumulated depreciation    
Depreciation 2,286 2,286
Adjustment 0 0
Net book value of assets 43,098 45,384
Accumulated depreciation    
Balance at the beginning 2,756 470
Disposal 0 0
Balance at the end ¥ 5,042 ¥ 2,756