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Segment Reporting and Significant Customer Information - Revenue by Type and Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 27,062 | $ 25,301 | $ 28,075 | $ 30,884 | $ 26,997 | $ 24,687 | $ 26,411 | $ 28,429 | $ 111,322 | $ 106,524 | $ 114,263
Travel |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 94,352 | 90,052 | 94,180
Local |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 16,970 | 16,472 | 20,083
Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 7,859 | 7,519 | 9,698
Asia Pacific | Travel |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 7,351 | 6,992 | 8,845
Asia Pacific | Local |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 508 | 527 | 853
Europe |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 36,149 | 33,681 | 36,907
Europe | Travel |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 30,856 | 29,180 | 31,087
Europe | Local |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 5,293 | 4,501 | 5,820
North America |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 67,314 | 65,324 | 67,658
North America | Travel |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 56,145 | 53,880 | 54,248
North America | Local |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 11,169 | $ 11,444 | $ 13,410

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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