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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 26,997 | $ 24,687 | $ 26,411 | $ 28,429 | $ 26,814 | $ 26,823 | $ 29,798 | $ 30,828 | $ 106,524 | $ 114,263 | $ 123,961
Travel |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 90,052 | 94,180 | 99,114
Local |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 16,472 | 20,083 | 24,847
Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 7,519 | 9,698 | 10,649
Asia Pacific | Travel |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 6,992 | 8,845 | 9,355
Asia Pacific | Local |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 527 | 853 | 1,294
Europe |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 33,681 | 36,907 | 39,736
Europe | Travel |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 29,180 | 31,087 | 33,603
Europe | Local |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,501 | 5,820 | 6,133
North America |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 65,324 | 67,658 | 73,576
North America | Travel |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 53,880 | 54,248 | 56,156
North America | Local |  |  |  |  |  |  |  |  |  |  |
Breakdown of revenues by type and segment |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 11,444 | $ 13,410 | $ 17,420

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