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Concentrations of risk and geographic information - Schedule of Customer Concentration by Risk Factor (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Concentration Risk [Line Items] |  |  |
Accounts receivable sold | $ 99,410 | $ 120,728 | $ 126,220
Factoring fees | $ 678 | $ 1,509 | $ 1,639
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer A [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk | 23.00% | 11.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer B [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk | 15.00% | 15.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer C [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk | 12.00% |  |
Customer Concentration Risk [Member] | Sales Revenue [Member] | Customer A [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk | 10.00% | 11.00% | 13.00%

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