v3.8.0.1
Plant and equipment, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Plant and equipment, gross $ 524 $ 16  
Less: accumulated depreciation (13) (11)  
Plant and equipment, net 511 5  
Depreciation 2 3 $ 3
Leasehold land and buildings (Note 9)      
Property, Plant and Equipment [Line Items]      
Plant and equipment, gross 499  
Machinery and equipment      
Property, Plant and Equipment [Line Items]      
Plant and equipment, gross 2 1  
Vehicles and office equipment      
Property, Plant and Equipment [Line Items]      
Plant and equipment, gross $ 23 $ 15