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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and equipment (Details)
12 Months Ended
Dec. 31, 2020
Leasehold improvements  
Property and equipment  
Useful life 10 years
Equipment | Minimum  
Property and equipment  
Useful life 3 years
Equipment | Maximum  
Property and equipment  
Useful life 10 years
Furniture, fixtures, fittings and other | Minimum  
Property and equipment  
Useful life 2 years
Furniture, fixtures, fittings and other | Maximum  
Property and equipment  
Useful life 10 years