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Trade receivables (Tables)
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Trade Receivables
Trade receivables by geographic region are analysed as follows:
 
   
31/12/19
   
31/12/18
 
Domestic customers
   14,401    20,247 
European customers
   4,348    7,815 
North American customers
   4,986    3,573 
South American customers
   5,703    3,531 
Chinese customers
   4,055    7,233 
Other foreign customers
   4,393    8,195 
  
 
 
   
 
 
 
Gross trade receivables
   37,886    50,594 
Allowance for doubtful accounts
   (8,699)    (9,627) 
  
 
 
   
 
 
 
Total trade receivables
  
 
29,187
 
  
 
40,967
 
  
 
 
   
 
 
 
Summary of Trade Receivables and Revenue
As at December 31, 2019 and 2018 and for each year of the
two-year
period ended December 31, 2019, the Group had customers who exceeded 5% of trade receivables as follows:
 
Year
  
No. of customers
  
% of trade receivables
2019
  
—  
  
—  
2018
  
2
  
21%
Summary of Provision for Doubtful Accounts
The following tables provide the movements in the allowance for doubtful accounts for the years ended December 31, 2019 and 2018.
 
   
31/12/19
   
31/12/18
 
Balance at beginning of year
   9,627    10,775 
Effect of the adoption of IFRS 9 (see note 5(C))
   —      37 
Charges – bad debt expense
   2,389    745 
Reductions – write off of uncollectible amounts
   (3,317)    (1,930) 
  
 
 
   
 
 
 
Balance at end of year
  
 
8,699
 
  
 
9,627