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Income Taxes - Deferred tax (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax position $ 262    
Gross | Warrants      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax position 4,289 $ 3,034 $ 1,463
Gross | Loss carry forward      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax position 3,759 1,270 136
Gross | Research and development expenditures      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax position 262    
Gross | Other items      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax position (6) (34) 48
Valuation allowance      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax position $ (8,042) $ (4,270) $ (1,647)