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Tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Specification of income tax [Abstract]        
Income tax payable $ 111 $ 74 $ 132  
Tax expenses related to previous year 32 1 8  
Change in deferred tax (12) 8 (8)  
Total income tax expense 131 83 131  
Specification of Temporary Differences and Deferred Tax [Abstract]        
Property, plant and equipment (13) (164) (164)  
Pensions (420) (539) (425)  
Total basis for deferred tax (432) (703) (590)  
Deferred tax liability (asset), net [1],[2] (102) (155) (136)  
Deferred tax (asset), gross [3] (126) (155) (136)  
Deferred tax liability, gross [3] 24 0 0  
Reconciliation of Effective Tax Rate [Abstract]        
Profit/(loss) before income tax 73,812 (46,845) 6,733  
Expected income tax assessed at the tax rate for the Parent company (0%) 0 0 0  
Adjusted for tax effect of the following items [Abstract]        
Income in subsidiary, subject to income tax 131 83 131  
Total income tax expense $ 131 $ 83 $ 131  
Expected income tax rate 0.00% 0.00% 0.00%  
Changes in Tax Rates [Member]        
Specification of Temporary Differences and Deferred Tax [Abstract]        
General income tax rate 22.00% 23.00% 24.00% 25.00%
[1] Due to materiality, recognized in prepaid expenses and not on a separate line in the statements of financial position.
[2] The general income tax rate is reduced from 23% to 22%, effective from fiscal year 2019, reduced from 24% to 23%, effective from fiscal year 2018 and reduced from 25% to 24%, effective from fiscal year 2017.
[3] Deferred tax liability is related to the subsidiary in Singapore and cannot be offset with the deferred tax asset related to the subsidiary in Norway.