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Concentrations of risk and segment information (Tables) | 9 Months Ended
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Sep. 30, 2015
Concentration Risk [Line Items] |
Schedule of Revenue by Geographic Region | Revenue by geographic region, based on ship-to destinations, was as follows:
| Three months ended |  | Nine months ended
(in thousands) | September 30, 2015 |  | September 30, 2014 |  | September 30, 2015 |  | September 30, 2014
Americas | $ | 190,839 |  |  | $ | 204,893 |  |  | $ | 583,282 |  |  | $ | 482,769 |
Europe, Middle East and Africa (EMEA) | 156,639 |  |  | 56,068 |  |  | 432,904 |  |  | 207,285 |
Asia and Pacific area countries (APAC) | 52,862 |  |  | 19,010 |  |  | 167,182 |  |  | 70,238 |
| $ | 400,340 |  |  | $ | 279,971 |  |  | $ | 1,183,368 |  |  | $ | 760,292 |
Accounts Receivable [Member] |
Concentration Risk [Line Items] |
Schedules of Customer Concentration by Risk Factor | The Company had the following customers who represented 10% or more of its net accounts receivable balance:
| September 30, 2015 |  | December 31, 2014
Customer A | 17% |  | 14%
Customer B | 16% |  | 17%
Customer C | 12% |  | *
Customer D | 10% |  | *
Customer E | * |  | 11%
* Less than 10% of total accounts receivable for the period indicated
Sales Revenue [Member] |
Concentration Risk [Line Items] |
Schedules of Customer Concentration by Risk Factor | Customers with revenue equal to or greater than 10% of the Company's total revenue were as follows:
| Three months ended |  | Nine months ended
| September 30, 2015 |  | September 30, 2014 |  | September 30, 2015 |  | September 30, 2014
Customer A | 14% |  | 27% |  | 14% |  | 19%
Customer B | 11% |  | * |  | * |  | *
* Less than 10% of total revenue for the period indicated

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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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