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Contract assets (Tables)
12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Contract Assets
Current contract assets:
 
   
31 December
2019
   
31 December
2018
 
Contract assets
   933,969    711,928 
  
 
 
   
 
 
 
  
 
933,969
 
  
 
711,928
 
  
 
 
   
 
 
 
Non-current
contract assets:
 
   
31 December
2019
   
31 December
2018
 
Contract assets
   10,291    3,513 
  
 
 
   
 
 
 
  
 
10,291
 
  
 
3,513