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Borrowings and debt (Details 6) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Borrowings and debt      
Payments of lease liabilities $ 1,114 $ 1,072 $ 0
Interest on lease liabilities (862) (912)  
Income from sub-leasing right-of-use assets $ 265 $ 277