v3.21.2
Property, plant and equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Plant and equipment, gross $ 58,817 $ 58,701
Impairment (1,415) (445)
Less: accumulated depreciation (5,261) (3,171)
Plant and equipment, net 52,141 55,085
Leasehold land and buildings    
Property, Plant and Equipment [Line Items]    
Plant and equipment, gross 58,646 58,536
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Plant and equipment, gross 17 11
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Plant and equipment, gross 13 13
Vehicles and office equipment    
Property, Plant and Equipment [Line Items]    
Plant and equipment, gross $ 141 $ 141