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Application of new and revised IFRS as issued by the IASB - Additional information (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Application of new and revised IFRS as issued by the IASB      
Right-of-use asset   $ 5,899  
Lease liabilities $ 4,220 $ 5,899 $ 0
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16 2.45%