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Property, Plant and Equipment - Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of attribution of expenses by nature to their function [Line Items]      
Total property, plant and equipment $ (221) $ (101)  
Operating Expense      
Disclosure of attribution of expenses by nature to their function [Line Items]      
Depreciation 105 80 $ 73
Research and development      
Disclosure of attribution of expenses by nature to their function [Line Items]      
Depreciation 90 64 58
General and administrative      
Disclosure of attribution of expenses by nature to their function [Line Items]      
Depreciation 15 16 15
Accumulated Depreciation      
Disclosure of attribution of expenses by nature to their function [Line Items]      
Depreciation 105 81  
Total property, plant and equipment 299 171 92
Property      
Disclosure of attribution of expenses by nature to their function [Line Items]      
Total property, plant and equipment (20) (35)  
Property | Accumulated Depreciation      
Disclosure of attribution of expenses by nature to their function [Line Items]      
Depreciation 71 67  
Total property, plant and equipment 237 144 79
Right-of-use assets      
Disclosure of attribution of expenses by nature to their function [Line Items]      
Total property, plant and equipment (20) (35)  
Right-of-use assets | Accumulated Depreciation      
Disclosure of attribution of expenses by nature to their function [Line Items]      
Total property, plant and equipment $ 236 $ 145 $ 79