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Borrowings - Mortgage payable (Details)
€ in Thousands, $ in Thousands
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure of detailed information about borrowings [line items]      
Borrowings   $ 15 $ 36
Mortgage payable      
Disclosure of detailed information about borrowings [line items]      
Notional amount | € € 185    
Borrowings   $ 15 $ 36
Mortgage payable | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Interest rate 5.00% 5.00%