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Leases - Movements in Right-of-use Assets and Lease Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases    
Cash outflow for leases $ 200 $ 0
Right-of-Use Asset    
Balance beginning of year 35 92
Additions 54 12
Depreciation (73) (67)
Payments 4  
Translation   (2)
Balance end of year 20 35
Lease liabilities    
Balance beginning of year 36 99
Additions 54 12
Interest expense   2
Payments (74) (75)
Translation 4 (2)
Balance end of year $ 20 $ 36