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Pensions - Changes in gross benefit obligation (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change In Gross Pension Obligation [Abstract]      
Gross obligation January 1 $ 1,111 $ 945 $ 706
Current service cost 325 360 285
Interest charge on pension liabilities 31 27 24
Past service cost - curtailment/plan amendment   (19)  
Settlement (gain)   (128)  
Social security expenses (44) (48) (43)
Remeasurements loss/(gain) 227 (18) (27)
Exchange rate differences 58 (8) (20)
Gross pension obligation December 31 $ 1,708 $ 1,111 $ 925