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Trade receivables | 12 Months Ended
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Dec. 31, 2019
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Trade receivables |
15 | 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 |
Trade receivables are due primarily from distributors and retailers who sell directly to end customers. Trade receivables due from related parties amount to 5,235 as at December 31, 2019 (9,333 as at December 31, 2018). Transactions with related parties are conducted at arm’s length (see note 43). 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%
In 2019, 2018 and 2017 no customer has exceeded 5% of revenue. 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 |
Information about the Group’s exposure to credit risk and impairment losses for trade receivables is included in note 30(C)(ii-a). Trade receivables denominated in foreign currencies as at December 31, 2019 and 2018 amount to 19,807 and 26,490, respectively.

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- Definition The disclosure of trade and other receivables. [Refer: Trade and other receivables] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_10_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Text block [abstract] + References No definition available. + Details
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