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Deferred income for capital grants (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Changes in the Carrying Amount of Deferred Income for Capital Grants

Changes in the carrying amount of deferred income for capital grants for the years ended December 31, 2018 and 2017 are analised as follows:

 

Balance as at January 1, 2017

      14,760  

Additions

      79  

Charges to profit or loss

      (1,068 ) 
  

 

 

  

Balance as at December 31, 2017

      13,771  

Additions

      292  

Charges to profit or loss

      (1,061 ) 
  

 

 

  

Balance as at December 31, 2018

      13,002