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Property and equipment (Details) - CNY (¥)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement [Line Items]      
Balance At Cost ¥ 53,720,000 ¥ 53,720,000 ¥ 53,720,000
Beginning Balance 8,567,000 5,590,000  
Depreciation 2,973,000 2,977,000  
Ending Balance 11,540,000 8,567,000  
Carrying Amount Of Assets 42,180,000 45,153,000  
Leasehold improvements [Member]      
Statement [Line Items]      
Beginning Balance 3,923,000 3,923,000  
Depreciation 553,000 553,000  
Ending Balance 3,923,000 3,923,000  
Carrying Amount Of Assets 1,060,000 1,613,000  
Additions 0 0  
Disposals   0  
Accumulated Depreciation      
Adjustment   0  
Balance At The Beginning 2,310,000 1,757,000  
Disposal   0  
Balance At The End 2,863,000 2,310,000  
Property [Member]      
Statement [Line Items]      
Beginning Balance 48,140,000 48,140,000  
Depreciation 2,285,000 2,286,000  
Ending Balance 48,140,000 48,140,000  
Carrying Amount Of Assets 40,813,000 43,098,000  
Accumulated Depreciation      
Balance At The Beginning 5,042,000 2,756,000  
Balance At The End 7,327,000 5,042,000  
Motor vehicles [member]      
Statement [Line Items]      
Beginning Balance 579,000 579,000  
Depreciation 0 0  
Ending Balance 579,000 579,000  
Carrying Amount Of Assets 29,000 29,000  
Accumulated Depreciation      
Balance At The Beginning 550,000 550,000  
Balance At The End 550,000 550,000  
Office equipment & furniture [Member]      
Statement [Line Items]      
Beginning Balance 1,078,000 1,078,000  
Depreciation 135,000 138,000  
Ending Balance 1,078,000 1,078,000  
Carrying Amount Of Assets 278,000 413,000  
Accumulated Depreciation      
Balance At The Beginning 665,000 527,000  
Balance At The End ¥ 800,000 ¥ 665,000