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Revenue from contracts with customers (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of revenue
    2018  
    US$’000  
Fixed price     20,104  
Excess of billings over costs
    2018     2017  
    US$’000     US$’000  
             
Costs incurred and estimated earnings on uncompleted contracts     6,354       6,342  
Billings on uncompleted contracts     (6,825 )     (7,868 )
Excess of billings over costs incurred and estimated earnings     (471 )     (1,526 )

 

    2018     2017  
    US$’000     US$’000  
             
Costs and estimated earnings in excess of billings on uncompleted contracts     899       194  
Billings in excess of costs and estimated earnings on uncompleted contracts     (1,370 )     (1,720 )
Net amount of billings in excess of costs and estimated earnings on uncompleted contracts     (471 )     (1,526 )