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Tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Specification of income tax [Abstract]        
Income tax payable $ 378 $ 587 $ 111  
Tax expenses related to previous year (27) 309 32  
Change in deferred tax 9 5 (12)  
Total income tax expense 360 900 131  
Specification of Temporary Differences and Deferred Tax [Abstract]        
Property, plant and equipment (11) 2 (13)  
Pensions (662) (612) (420)  
Total basis for deferred tax (674) (610) (432)  
Deferred tax liability (asset), net [1],[2] (152) (140) (102)  
Deferred tax (asset), gross [3] (166) (161) (126)  
Deferred tax liability, gross [3] 14 21 24  
Reconciliation of income tax expense [Abstract]        
Profit/(loss) before income tax (11,147) 267,181 73,812  
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 360 900 131  
Total income tax expense $ 360 $ 900 $ 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%
[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 was reduced from 23% to 22%, effective from fiscal year 2019.
[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.