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REVENUE AND OTHER INCOME - Operations by business segment (Details) - CNY (¥)
¥ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Disclosure Of Operating Segments (Line Items)      
Total revenues ¥ 50,107 ¥ 39,787  
Total cost of revenues 56,610 38,848  
Operating segments | Revenues      
Disclosure Of Operating Segments (Line Items)      
Total revenues 50,107 39,787  
Operating segments | Revenues | Sale of tile products      
Disclosure Of Operating Segments (Line Items)      
Total revenues 42,186 39,787  
Operating segments | Revenues | Sale of software use right      
Disclosure Of Operating Segments (Line Items)      
Total revenues 7,921    
Operating segments | Cost of revenues      
Disclosure Of Operating Segments (Line Items)      
Total cost of revenues 56,610 38,848  
Operating segments | Cost of revenues | Sale of tile products      
Disclosure Of Operating Segments (Line Items)      
Total cost of revenues 53,790 38,848  
Operating segments | Cost of revenues | Sale of software use right      
Disclosure Of Operating Segments (Line Items)      
Total cost of revenues 2,820    
Operating segments | Operating costs and expenses      
Disclosure Of Operating Segments (Line Items)      
Total operating costs and expenses 64,259 112,362  
Operating segments | Operating costs and expenses | Sale of tile products      
Disclosure Of Operating Segments (Line Items)      
Total operating costs and expenses 50,709 112,362  
Operating segments | Operating costs and expenses | Sale of software use right      
Disclosure Of Operating Segments (Line Items)      
Total operating costs and expenses 1,977    
Operating segments | Operating costs and expenses | Other      
Disclosure Of Operating Segments (Line Items)      
Total operating costs and expenses 11,573    
Operating segments | Loss (income) from operations      
Disclosure Of Operating Segments (Line Items)      
Loss (income) from operations 70,769 111,508  
Operating segments | Loss (income) from operations | Sale of tile products      
Disclosure Of Operating Segments (Line Items)      
Loss (income) from operations 68,094 ¥ 111,508  
Operating segments | Loss (income) from operations | Sale of software use right      
Disclosure Of Operating Segments (Line Items)      
Loss (income) from operations (3,115)    
Operating segments | Loss (income) from operations | Other      
Disclosure Of Operating Segments (Line Items)      
Loss (income) from operations 5,790    
Operating segments | Segment assets      
Disclosure Of Operating Segments (Line Items)      
Total assets 179,459   ¥ 225,386
Operating segments | Segment assets | Sale of tile products      
Disclosure Of Operating Segments (Line Items)      
Total assets 134,010   ¥ 225,386
Operating segments | Segment assets | Sale of software use right      
Disclosure Of Operating Segments (Line Items)      
Total assets 17,956    
Operating segments | Segment assets | Other      
Disclosure Of Operating Segments (Line Items)      
Total assets ¥ 27,493