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Prepaid expenses, deposits and other assets (Tables)
 12 Months Ended
Dec. 31, 2019
Prepaid Expenses Deposits And Other Assets Tables Abstract  
Schedule of prepaid expenses, deposits and other assets
    2019     2018  
Prepaid expenses     1,150       1,534  
Deposits and other receivables     2,098       1,967  
      3,248       3,501