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Segment Reporting and Significant Customer Information - Revenue by Type and Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Breakdown of revenues by type and segment |  |  |  |
Total revenues | $ 24,687 | $ 26,823 | $ 79,527 | $ 87,450
Asia Pacific |  |  |  |
Breakdown of revenues by type and segment |  |  |  |
Total revenues | 1,773 | 2,557 | 5,536 | 7,251
Europe |  |  |  |
Breakdown of revenues by type and segment |  |  |  |
Total revenues | 7,946 | 8,474 | 24,914 | 28,490
North America |  |  |  |
Breakdown of revenues by type and segment |  |  |  |
Total revenues | 14,968 | 15,792 | 49,077 | 51,709
Travel |  |  |  |
Breakdown of revenues by type and segment |  |  |  |
Total revenues | 20,842 | 22,185 | 67,938 | 72,512
Travel | Asia Pacific |  |  |  |
Breakdown of revenues by type and segment |  |  |  |
Total revenues | 1,644 | 2,334 | 5,170 | 6,582
Travel | Europe |  |  |  |
Breakdown of revenues by type and segment |  |  |  |
Total revenues | 7,052 | 7,357 | 21,852 | 24,440
Travel | North America |  |  |  |
Breakdown of revenues by type and segment |  |  |  |
Total revenues | 12,146 | 12,494 | 40,916 | 41,490
Local |  |  |  |
Breakdown of revenues by type and segment |  |  |  |
Total revenues | 3,845 | 4,638 | 11,589 | 14,938
Local | Asia Pacific |  |  |  |
Breakdown of revenues by type and segment |  |  |  |
Total revenues | 129 | 223 | 366 | 669
Local | Europe |  |  |  |
Breakdown of revenues by type and segment |  |  |  |
Total revenues | 894 | 1,117 | 3,062 | 4,050
Local | North America |  |  |  |
Breakdown of revenues by type and segment |  |  |  |
Total revenues | $ 2,822 | $ 3,298 | $ 8,161 | $ 10,219

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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