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Disaggregated revenue from contracts (Tables)
12 Months Ended
Dec. 31, 2020
Disaggregation of Revenue [Abstract]  
Disaggregated revenue from contracts
   Year ended December 31,
   2020  2019  2018
    US$’000    US$’000    US$’000 
Revenue               
Trading and manufacturing (revenue recognized at point in time)   9,476    11,877    13,770 
Engineering (revenue recognized over time)   3,881    5,522    6,334 
                
    13,357    17,399    20,104