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Accounts payable and accruals (Tables)
 12 Months Ended
Dec. 31, 2019
Accounts Payable And Accruals Tables Abstract  
Schedule of accounts payable and accruals
    2019     2018  
Trade payables     7,128       4,567  
Accrued expenses     2,801       2,072  
Accrued wages and other benefits     575       1,842  
Others     750       973  
      11,254       9,454