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Payroll and social securities payable - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Non-current    
Social security payable $ 1,209 $ 1,219
Non-current payroll and social security liabilities 1,209 1,219
Current    
Salaries payable 3,290 3,785
Social security payable 3,025 3,112
Provision for vacations 8,808 9,770
Provision for bonuses 10,085 9,311
Current payroll and social security liabilities 25,208 25,978
Total payroll and social security liabilities $ 26,417 $ 27,197