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Trade receivables (Tables) | 12 Months Ended
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Dec. 31, 2019
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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 |

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- Definition The disclosure of the reconciliation of changes in the loss allowance and explanation of changes in the gross carrying amount for financial instruments. Loss allowance is the allowance for expected credit losses on financial assets measured in accordance with paragraph 4.1.2 of IFRS 9, lease receivables and contract assets, the accumulated impairment amount for financial assets measured in accordance with paragraph 4.1.2A of IFRS 9 and the provision for expected credit losses on loan commitments and financial guarantee contracts. [Refer: Gross carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35H&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35I&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Disclosure of customers who exceeded five percentage of trade receivables and revenue. + References No definition available. + Details
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- Definition The disclosure of provisions for doubtful accounts. + References No definition available. + Details
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