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Pensions (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Participant
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Pensions [Abstract]      
Number of participants in benefit plan | Participant 12    
Defined Benefit Pension Plan [Abstract]      
Minimum age to entitled 70% of base salary at retirement date 67 years    
Percentage of base salary entitled at retirement date 70.00%    
Calculation of Annual Pension Costs [Abstract]      
Current service cost $ 406 $ 403 $ 329
Financial costs 14 10 6
Pension costs for the year 420 413 335
Pension liability recorded in balance sheet [Abstract]      
Present value of the defined benefit obligation 2,494 1,971 1,481
Fair value of plan assets 1,788 1,614 1,266
Net pension obligation 707 357 215
Remeasurement loss/(gain) (287) 182 211
Net balance sheet recorded pension liability 420 539 425
Change in Gross Pension Obligation [Abstract]      
Gross obligation January 1 2,090 1,708 1,111
Current service cost 401 398 325
Interest charge on pension liabilities 54 42 31
Past service cost - curtailment/plan amendment 0 0 0
Settlement (gain) 0 0 0
Social security expenses (31) (57) (44)
Remeasurements loss/(gain) (1,055) 119 227
Exchange rate differences (21) (119) 58
Gross pension obligation December 31 1,439 2,090 1,708
Change in Gross Pension Assets [Abstract]      
Fair value plan asset January 1 1,551 1,282 886
Interest income 36 27 20
Settlement 0 0 0
Employer contribution 216 404 313
Remeasurements (loss)/gain (768) (63) 16
Exchange rate differences (16) (99) 47
Fair value plan assets December 31 1,019 $ 1,551 $ 1,282
Estimated contribution to pension plan in 2020 $ 228    
Assumptions [Abstract]      
Discount rate 2.30% 2.60% 2.40%
Yield on pension assets 2.30% 2.60% 2.40%
Wage growth 2.25% 2.75% 2.50%
G regulation [1] 2.00% 2.50% 2.25%
Pension adjustment 0.50% 0.80% 0.50%
Average remaining service period 19 years 18 years 18 years
[1] Increase of social security base amount ("G") as per Norwegian regulations.